https://bugs.winehq.org/show_bug.cgi?id=45380
--- Comment #4 from ryampolsky@yahoo.com --- (In reply to ryampolsky from comment #3)
Maybe I should have mentioned that I have the Ubuntu 'Light' theme enabled. But I just tried it with no theme enabled, and it still happens there. But only if the color setting for selected text has a white foreground - which wasn't the default when I disabled the theme.
Oh, and I'm running EditPlus version 3.80 (32 bit). It's the only version I have a paid license for. But I did just download it recently using this URL:
https://www.editplus.com/latest.html