Would someone post a Constant Guard filename please? No idea whether I have it, not something I've knowingly done. My experience in FSX is similar but when back on the desktop I find that problems continue - I click on 1 icon - so far, so OK - I then click on another one - and ALL the icons between the two are highlighted!My machine has a multiboot setup (with HyperOS) & the other installations that don't include FSA have no problems so it's not hardware related.Thanks, Roger