I am not using qtlockscreen and can confirm that my N900 behaves just like what algiz said. ie,
desktop > lock > unlock > desktop
app > lock > unlock > app
taskswitcher > lock > unlock > taskswitcher
app menu > lock > unlock > app menu

i am thinking guilledocs problem might be because of qtlockscreen
but algiz has qtlockscreen and is working as normal

probably thats the problem becouse I do have installed qtlockscreen recently and this started to happend but i wanted to ask becouse it started at same time the upgrade of the cssu.
this is anoying maybe Ill try to uninstall the qtlockscreen and see what happen

Here you go my personal transitions.ini. This will help improve your device animation and rotation is very similar to those on Android.
Fast rotation and fast transition. This transition is best with/without HWSync. Hope you like it. If you do like it then do Thanks me click the button.

Incase those who'd not have a clue of where to do it. Here is the detail:

sudo gainroot
leafpad /usr/share/hildon-desktop/transitions.ini

Copy and paste this and save
==================================================

# This file contains timings and values for transitions in hildon-desktop
# duration = time in milliseconds
# zoom = amount to zoom out the background. 1 = none, 0.5 = zoom to half size
# radius = radius of blur (this is actually the number of blur iterations,
# so the bigger the number the longer it takes)
# saturation = the amount of colour left in the background (0 = grey, 1 = normal)
# brightness = brightness of the background (0 = black, 1 = normal)

[blur]
turbo = 0
duration = 200

# Zoom out of the task navigator before it fades out
# -- zoom: how much to scale the switcher when going to launcher
# (the second layer of the launcher would scale it twice
# as much but the switcher is hidden by that time currently)
# -- zoom_for_home: how much to scale the switcher when leaving for home
# -- zoom_duration: the number of miliseconds to spend on zooming
# a thumbnail
# -- fly_duration: how long should it take for the thumbnails to rearrange
# -- notifade_in/out: time to fade the notifications
#
[task_nav]
zoom = 0.85
zoom_for_home = 1.4
zoom_duration = 250
fly_duration = 250
notifade_in = 150
notifade_out = 150
tile_font = Nokia Sans 15

# Blurring of the home view
# -- radius: amount of iterations of blur filter to perform when not zoooming
# eg. for dialogs
# -- radius_more: amount of iterations of blur filter to perform when zooming
# eg. for launcher/task navigator
# -- saturation: saturation of the background when blurred
# -- brightness: brightness of the background when blurred
# -- zoom: Basic amount to scale the home view by (gets multiplied by how many
# 'levels' deep the UI is - eg. launcher is one level, launcher submenu
# is another)
# -- zoom_applets: Amount to scale applets by when zooming out
# -- zoom_on_press: set to 1 to include a zoom effect when the screen is pressed
# -- parallax: Amount of parallax between desktop and widget layers when panning

[home]
radius = 0
radius_more = 0
saturation = 1.0
brightness = 1.0
zoom = 1.0
zoom_applets = 1.0
zoom_on_press = 0
parallax = 1.4

# These control the deceleration of the launcher pages. When panning freely
# (decelerating) the velocity of the launcher page is adjusted by this much.
# strong_deceleration_rate is effective in the bouncing zones. Uncomment if
# you want faster panning.
[launcher]
#deceleration_rate = 0.98
#strong_deceleration_rate = 0.7

# The glow effect around launcher buttons[launcher_glow]
duration_in = 100
duration_out = 200
radius = 14
brightness = 0.95

# The items below are for the transitions that are applied
# to a 'page' of launcher icons
# -- duration: time in ms
# -- depth: amount to move icons backwards and forwards (with perspective)
# this is pretty much how big or small the icons get
# -- sequenced: for in and in_sub, whether icons swoop nicely in (1)
# or whether they just all zoom in as one (0)
# -- keyframes: A list of values that are linearly interpolated between
# to produce the movement of the launcher tiles. There can
# be any number of values as long as there are 2 or more.
# <1 means nearer the viewer, >1 means further away
# -- keyframes_label: The values used for fading in the labels. 0=transparent
# 1=opaque
# -- keyframes_icon: The values used for fading in the icons. 0=transparent
# 1=opaque
# Launcher top layer first appearing
[launcher_in]
duration = 50
sequenced = 0
depth = 225
keyframes = 0,0.17,0.39,0.65,0.87,1.13,1.26,1.22,1.17,1.13,1.0 9,1.04,1,1,1,1,1,1,1,1,1
keyframes_icon = 0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1,1,1,1,1,1, 1,1,1,1,1
keyframes_label = 0,0,0,0,0,0,0,0,0,0,0,0.1,0.2,0.3,0.4,0.5,0.6,0.7, 0.8,0.9,1

# Launcher top layer disappearing
[launcher_out]
duration = 50
depth = 150

# launcher top layer disappearing when a layer in front
[launcher_out_back]
duration = 50
depth = 150

# launch animation
# duration_out - amount of time to take when fading the launcher out and application in
# delay - the amount of time to wait after the window has appeared before we fade out
# (this time is *included* in duration_out, so it must be <= duration_out)
[launcher_launch]
duration = 400
delay = 500
duration_out = 700
depth = 100

# sub-menu appearing
[launcher_in_sub]
duration = 50
sequenced = 0
depth = 200
keyframes = 0,0.17,0.39,0.65,0.87,1.13,1.26,1.22,1.17,1.13,1.0 9,1.04,1,1,1,1,1,1,1,1,1
keyframes_icon = 0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1,1,1,1,1,1, 1,1,1,1,1
keyframes_label = 0,0,0,0,0,0,0,0,0,0,0,0.1,0.2,0.3,0.4,0.5,0.6,0.7, 0.8,0.9,1

# sub-menu disappearing
[launcher_out_sub]
duration = 50
depth = 150
sequenced =1

# main disappearing when sub-menu appears
[launcher_back]
duration = 50
depth = 200
sequenced = 0

# main appearing when sub-menu disappears
[launcher_forward]
duration = 50
depth = 200
sequenced = 0


# Screen rotation transition
# duration_in = time for rotation before blanking
# duration_out = time for rotation after blanking
# damage_timeout = in the rotation transition, the amount of milliseconds to
# leave after we get a damage event before we transition back
# from blanking.
# damage_timeout_max = maximum amount of time we may wait if we keep getting
# damage events.
# angle = rotation angle for each transition, in degrees. Ideally this is set
# so that the screen looks like it keeps turning at the same speed
# during blanking. 0 is none, 90 degrees is side-on
[rotate]
duration_in = 0
duration_out = 0
damage_timeout = 0
damage_timeout_plus = 0
damage_timeout_max = 0
angle = 0
# changed from 100 in order to reduce jerkiness of transition (also changed the
# fade-out so it doesn't fade to black completely)

# App close transition
[app_close]
duration = 450

# Popup for dialogs and status menu
[popup]
duration_in = 250
duration_out = 250

# Fade in for banners
# _alpha specifies the final transparency of various things
# currently only banner_note and info_note are supported
[fade]
duration_in = 200
duration_out = 500
banner_note_alpha = 0.85
info_note_alpha = 0.85

# Transition for notification previews
[notification]
is_cool = 0
duration_in = 400
duration_out = 450

# Sliding subview window transition
[subview]
duration_in = 250
duration_out = 250

[loading_timeout]
# This is multiplied by the load average to find the timeout
# in seconds. before "Unable to load" is displayed. There is
# a minimum of 10s.
load_average_factor = 4.5

# Edit mode configuration
[edit_mode]
snap_grid_size = 4
# Set to 0 if snap to grid should be only happen when widget is released
snap_to_grid_while_move = 1

##
# Special tweaks (a restart might be required)
##
[thp_tweaks]
# Blurless desaturation (0 = default, 1 = MeeGo/Symbian-style)
blurless = 1

# Bigger task switcher (0 = default, 1 = single column, 2 = two columns)
taskswitcher = 0

# Rotation around the Z axis (0 = rotate around X/Y, 1 = rotate around Z)
zaxisrotation = 1

# Forced app auto-rotation (0 = default, 1 = auto-rotate every app)
forcerotation = 0

# Popup feedback using the "tactile" utility (0 = disabled, 1 = enabled)
# You need to install "tactile" from the maemo.org repositories for this
tactilepopups = 0

I have been unable to send e-mails via Modest when using Tree View mode, is this possible?

I use tree view mode all the time, mail sends just fine. Maybe it's a setting wrong on your SMTP service?