Having had some desktop difficulties, I write this in case it helps others with similar problems.
Leap 42.1 worked very well – I had no real problems. But as soon as I began using 42.2 (and later 42.3) several unwanted things started happening. My desktop PC system was running KDE with a GeForce 9400GT GPU which is Nvidia based.
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Using Nouveau, desktop freezing occasionally, needing a hard reset.
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Also with Nouveau, Firefox scroll bar and selection boxes invisible. Other apps (including browsers) appeared unaffected AFAIK.
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With Nvidia drivers, after resuming from suspend mode, the text space under desktop icons is trashed (but the text is ok). Reboot required.
I tried a lot of things to fix it (including of course installing all updates) even a different GPU (MSI 710GT – also Nvidia based) but nothing worked.
Finally I decided to try a Radeon GPU and fitted a Sapphire HD6450 in a clean installation. The problems immediately vanished. I haven’t installed anything in the way of GPU drivers - whatever software comes with 42.3 KDE is clearly doing the job OK.