With the old version 1.91.6 I just had this strange bug:
Search vor *.mpg in around 8GB of *.jpg, *.avi, *.mpg and delete all them.
Now search vor *.avi also and delete them. Ups ... he began also to delete *.jpg until a write protected one asked for deletion
(recovered from Backup, no problem.)
Some minutes later XNView crashed.
I tried to reproduce it, but was not able.... So simply this little report.
[Exact: Ctrl-F, *.avi with no options except [x]subdir -> View -> Ctrl-A -> Shift-Del]
Anyway still some more 2100 Thanks for XNView

Bruno