I have had this problem with v11 builds a few times (various builds). I was always able to isolate the problem file (which almost always was a screwy file that wouldn't play properly anyway). The process was tedious and manual though ...
Unfortunately, the evil files have been since purged from my system, so I don't have an example file to provide, but ...
Process:
1. Determine which file number MC chokes on. This is easy enough, as it lists the file # as it imports them, but you have to watch it (because once it crashes the message "# of #" disappears). It would be nice if MC logged this and the filename to a text file for situations like this (you could easily overwrite the file on each import or erase the log after the import process completed sucessfully).
2. Locate the file in Windows Explorer. MC seems to import from the "bottom up" (meaning the files that would typically be sorted last alphabetically in the directory are imported first). To do this, I just counted manually. (Tip: If you Shift-Select multiple files in Explorer the status bar will tell you how many files you've selected. I just made a separate "holding" folder and grabbed files 100 at a time and drag-dropped them into the other folder - to get them out of the way - keeping count until I got close to the problem file. Then, once it was deleted it was easy to scan the remaining files in the original directory to make sure there weren't any more hiding in there.)
3. Move or delete the file. Import again.
EVERY time I encountered this problem, there was REALLY something wrong with the file (or my filesystem). In most cases, when I simply selected the file in Windows Explorer (not even opened the file, simply selected it) it would crash Explorer.exe (which forced me to resort to deleting/moving from the command prompt).
I'm not sure where these screwy files came from, but I suspect it was due to filesystem errors that ocurred before I switched over fully to a RAID system. In some cases, I KNOW the files worked at one time, but somehow became corrupted.