Large empty space where IDE menu should be

The version 1.8.11 IDE goes haywire on my Ubuntu 19.10 machine. Reverting to IDE version 1.8.10 is fine, though.

It's difficult for me to give much more information because the UI is completely non-functional, i.e. no menus etc. All I get is the two sections, with a huge cursor in the bottom one. I can close it without a problem, but that's all I can do.