I have some series with lots of episodes but MediaPortal and MB Classic is only showing the thumbs without filenames which make it hard to find an episode. After some experimenting by renaming a couple of files, I determine it was caused by the square brackets in the filename. These files had no problem in MB2.
Say I have media files with tags stored as:
\\fs\TV\Show 1 (2013)\
[tag1] file 01 [tag2].avi
[tag1] file [tag2] 02.avi
In both MB Web MediaPortal and MB Classic, file 01 would not show filename while file 02 would just show 02. MB seems to be ignoring any characters in between the 1st open and last close square brackets:
[tag1] filename 01 [tag2].avi -->
[tag1] filename [tag2] 02.avi --> 02
MB Server version: 3.0.5031.21343
MB Classic version: 3.0.74.0 B10-3.1