guys I use MussOrgsky but for some of the songs that has no album cover Media Player gives default image, in the beggining it was black field and now it is strange pic from one song. It seems that when there is no album cover for a song it gives the new picture istead but I dont want any picture except no picture as it was at the begginig

I have that same prob.

Same here. Even songs which show the correct album cover in iTunes are changed to one of four unrelated album covers in Ovi Suite and therefore my N900. You can change each photo which is incorrect, but not all at once. Only one at a time. Here's how:
1) In Ovi Suite find the first song/artist with the incorrect image.
2) Search for the correct image using Google (or what ever search site you prefer) or in your computer -If using google click the "Images" tab at the top of the window, then on the left under the size selection select "Large"-
3) In google click the correct image and then click "Full-Size Image"
4) Press and hold your left mouse button and drag the image to Ovi and drop on top of the incorrect image.

Do this for every incorrect image.

5) Sync your N900's music section.
Done

For incorrect text you need to find the particular song file in your computer, right click the song file and select properties (or however you view the ID3 info on your OS) and then the Details tab find the incorrect info and change it. Then go back to Ovi Suite and delete everything in the music section (make sure you don't select the option which deletes the files from your computer). Then add them back to Ovi Suite.

Make sure you edit the incorrect text data first or the image changes may all be for nothing.

While this is a pain in the butt, it does resolve the issue.

Hope it help.