Here's the latest windowlab release. Reproducible: Always
Created attachment 114506 [details, diff] windowlab-1.31-fixed-font.patch Patch from bug #145907 by Stephen Tallowitz <dev@tallowitz.ch>.
Created attachment 114508 [details] windowlab-1.34.ebuild Proposed ebuild. It solves bugs #145913 and #145907.
Fixed in CVS.