These are blank thumbnails within FTM 2012, not on Ancestry. They start occurring when FTM 2012 starts to go South. If you restart FTM they look correct.
I would consider another program, but I really use the Sync a lot (since the corruption issues were fixed). I use Ancestry to communicate finds & updates to family
15,000 persons - 50Mb on autobackup, 8.2Gb for full backup (lots of documents)
I am a retired Software Engineer