Notice most thumbs images are missing.
Selecting View->Rebuild Thumbnails corrects the problem for this session:
If I close MP at this point, then reopen it, MP again displays screen shown in No. 1.
- 0. Delete MP's XnView.db
1. Open MP 0.3
2. Navigate to an image folder
3. Observe (or force) creation of thumb images
4. Close MP 0.3
5. Reopen MP 0.3
6. Observe that thumb images are missing
7. Press Refresh thumbs or change thumb size
8. Observe MP recreating thumb images
9. Close MP 0.3
10. Reopen MP 0.3
11. Observe missing thumb images (again)