- press ctrl+c
- in explorer press ctrl+v to paste selected files
- tag the other 2 files (C, D)
- press ctrl+c
- in explorer press ctrl+v to paste tagged files
= previously selected files (A, B) are pasted instead of tagged files (C, D) - there is no dialog - I have selected to always use tagged files instead of selected files in previous version
- while C, D files are tagged, select the other 2 files again (E, F)
- press ctrl+c
- in explorer press ctrl+v to paste selected files
= previously selected files (A, B) are pasted instead of currently selected files (E, F)
- now select file G
- press ctrl+c
- in explorer press ctrl+v to paste selected file
= no file is pasted
Perhaps something has been changed in the last few versions and the option "Always use tagged files instead of selected" (or similar) doesn't work good because of that, but tagging doesn't work at all here.

I tried to delete category.db file, I tried also all "Tagged file must be cleared:" options, always the same results.
XnView v1.93.3, Windows XP SP2.