Linux PC freezes after cura appimage start (now REALLY solved)

Hi Community, I'm using Cura (appimage 4.2.1.) since a couple of months on a Linux PC (with a not-brand-new SuSe 13.1) without any problems. Starting just some hours ago the PC freezes after the appimage start (tried it several times). Means, the little Cura windows with the Ultimaker Tobot appears, like always, then the normal Cura window appears very briefly, then the screen gets black, then back to normal but from this point on there is no reaction at all, no mouse, no

@getglenn: Hi, read your last post... I don't have a qtshadercache-folder, at least not in ./cache, but there is a cura-folder there with a /qmlcache sub-folder. I simply renamed the cura-folder, started the appimage and... it worked! Cura created a new /cache/cura folder, after one use nearly empty, while the old cura-cache was nearly 700 MB (!) something went wrong there... So, now its REALLY solved (i hope)... the second problem - see my separate post: is now also solved, there wer