> However, there is an odd behavior. I have Options|File Loading|Movie/Sound|Thumbnail options|Percentage of file length checked and set to 25%. If I select multiple and press F3 or scan folder or scan tree, the generated thumbnail seems to ignore this setting. If I select an individual video and press F3, a different thumbnail is generated from what the scan generated and it appears to observe this option setting.
That's interesting! So, for you the regular thumbnailing commands produce thumbnails from the wrong part of the movie files, and I get generic icons instead of thumbnails.
My "Percentage of file length" setting was at 76%, but changing it to your value of 25% didn't make a difference.
The way that I make thumbnails for multiple movie files is by selecting them and then pressing INS to tag them. When a non-thumbnailed file is tagged, ThumbsPlus makes a thumbnail for it before adding the tag. So, that is the workaround that I use.. the thumbnails that I get are the same as when I press F3 on a separate file, and the "Percentage of file length" option seems to work correctly.