Hmmm... Windows says my driver is up to date, The AMD Catalyst utility says my driver is up to date, but the AMD web site has a driver dated 1 month later than the date Windows reports for my existing one. I downloaded and installed it, but the problem is still there.
There is a beta drive on the AMD web site, maybe I'll try that.
This occured before had this computer with the SSD and everything was on a normal HD, so I don't think it is the SSD.
I'll try a reinstall.
It does not happen on my laptop, which has a regular HD, 16 GB ram, Radeon graphics as well, but an Intel rather than AMD processor. However, before I got the new desktop with the SSD, my old desktop was an Intel.