When doing "Add Movies -> Search your HD for Movies -> Select Files and selecting an AVI and then "Import Selected Movies" the program imports garbage (for example in the "Media" tab of the movie - check it out) or nothing at all (for example length in "Movie" tab)...
FYI I reverted back to 6.2.4.0 and importing the movie as described above worked perfectly. Therefore there really is a bug as described above in 6.2.5.0
The last full install I did was 5.8.2. I have been installing updates since. So at 6.2.4 I installed the update to 6.2.5 and discovered the bug. So I re-installed the 6.2.4 update. Today I installed the update to 6.2.6 (from my 6.2.4 version) and the bug was still there, so I re-installed the 6.2.4 update and the bug went away again.