Wrong dialogs appearing at rename (very annoying): http://newsgroup.xnview.com/viewtopic.php?f=62&t=29254
Misaligned Rename edit boxes if the thumbs are small enough: (ugly)
Hidden Rename edit boxes if the name of the folder is big enough and deep enough: (painful basic usability failure)
(yes, the folder edited above is called 'Test Flash Bender with Gel' - go figure how I edited it )
The solution for all these:
Rename Popup Windows
the screen shot is from FSViewer... ...but XnView Classic has one. Why we don't have it anymore?

Advantages:
- no more spurious annoying problems when the user press {Cancel}
- no more bounding problems. The window will be centered on screen.
- Auto-Correct support. A big plus.
- Trimming support. A big problem with these programs is that when one copies the file/folder name from an email (or elsewhere), many times copies also some special characters like tab (#9) enter (#13) or line-feed(#10). By having a popup window one can very easy remove these chars before sending them to the OS.
- Hiding the extension. Yeah, a good thing to have. We have it but only in a half. I like much better the version from XnView Classic. Why it was abolished?