Hi, now I had it happen again in a quite clear way.
I ingested around 1000 CR2 files, rated them, move some to a folder, rated the remaining 421 ones again, and now it happended on the last of 421 images in the folder. Mouse rating does not work, but keyboard rating works. This is ONLY on the last image! Usually this happens to alla images from a point and on, so I must have hit the limit exectly here. I am running 4.6.2.1 on Windows Vista Ultimate 64bit with 4 cores and 12Gb RAM.
Thumb size was #4 from right, it I go down even one step in size even the last images rates OK with the mouse!
Started rating at the top.
To get rid of this I have to restart PM.
Rgds
PM