@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