- change view to "Thumbnails"
- use layout #5 *
- search for all files in folder with many subfolders and many files *
- click the small [v] button next to "View as"
- select "Thumbnails & Details" (using F9 or directly clicking the main "View as" button works good)
= thumbnails are too small, Details view is used with small thumbnails

* - probably not needed, I can't always reproduce this bug, I could send the ini file to you (Pierre), if you want.
XnView 1.95.4, 1.96 beta 3, Win Vista SP1.