I'll post here the same problem that I posted to Nokia Discussions:
I don't remember exactly what happened, but my phone was quite slow before I rebooted it. After booting, every message in conversations disappeared (text messages and im).
Now when I get now messages, those appear normal in those new messages, but when I try to reopen those from conversations, it says no conversations. Even messages I sent doesn't appear there.
I found new problem today.
I logged in into a msn messenger account and used it for a while. when i tried to send new IM via conversations, it said no contacts. Then i sent IM via contacts, it showed messaging history completly, but still, nothing in conversations.
Ok, now i checed, I've got the same problem with the call log.
I tried to use this: /t5/Maemo-Devices/Missing-Text-Messages/m-p/695882/highlight/true#M12167
It didn't work, but it proves me that, those messages are somewhere one the phone. Because after reboot, it said i've got ten new messages. So the problem is in the Conversations.
I'll post here the same problem that I posted to Nokia Discussions:
There's also problem with Call Log, it shos that latest call is from last friday, but I called five minutes ago.