KidsRuby crashing on thin clients

[dbclinton]

Has anyone successfully deployed KidsRuby v. 1.3 (a great tool for 
teaching Ruby programing skills) on thin clients? I have no trouble 
running it on my server, but the program simply crashes whenever the 
user tries to run his code. I filed a bug at 
https://bugs.ruby-lang.org/issues/7985 - the only feedback from them so 
far is "Seems to be a QtGui font bug."
Anyone here have any ideas?