When I tried to enter a license key when in dark mode, the window's background was white but so was the text. This makes in hard to know which data goes where.
Fixed in version 3.10.1, thanks a lot for reporting.
Yang
I noticed that you “special thanks” window has the same issue.
I use Core Shell all the time. It’s a truly great tool. I do wish there was an iPad version though 
Thank you for this catch, will fix it in next release.
I'm working on this very hard, there are still some technical issues to be resolved.
Yang