2.3.1-alpha on Linux Mint - Printer Settings pop-up unintelligible

[dvanco]

I cannot look at / alter printer settings on Linux Mint 19 - the window that opens when attempting to adjust settings has some weird rastering going on

none of the other "adjustment" widgets that have a pop-up have this issue - it is just the Printer Settings. Rather critical as I need to change bed types. Don't know if there's a config file I can tweak as I looked through the json bits looking for some mention of the default bed type and found nothing. I suppose I can create custom filament profiles and alter the bed temps as required.....

If I can provide more info just ask.