Quote Originally Posted by NickJP View Post
Prior to installing Windows 10 on this machine I had first Windows 7 and then 8.1 installed, and never had any such problem. In fact, I've been running dual monitor setups with dissimilar resolution monitors on a series of machines for at least the past 15 years, and had no problem until I installed Windows 10 a couple of months ago. This machine is also dual-boot with Linux Mint, and no problem there with open apps being moved to the primary monitor after screen save. Only after installing Windows 10 have I encountered this problem.
"had no problem until I installed Windows 10"..., therein lies the problem. Windows 10, as it turns out, is a camel-sized dog, with camel numbered fleas!