One possibility is that Racket was working with GTK3 before, but GTK3
broke that (or broke your GTK3 theme) in a newer version. I've heard
developer complaints about this, and about engineering culture changes
and politics.
Firefox might be a good example to look at. Some URLs that don't
involve cursing or intrigue:
https://wiki.archlinux.org/index.php/firefox#Firefox_looks_bad_with_GTK.2B_.3E.3D3.20
https://bugzilla.mozilla.org/show_bug.cgi?id=1268234
I no longer have a good long-term recommendation for open source desktop
GUI toolkits; maybe next year. For now, I go to some trouble to use
GTK2 apps whenever possible.
The good news: for most of us developers using Racket on GNU/Linux, one
nice side-effect of the Racket cross-platform desktop GUI stuff is that
we don't have to decide whether to code for GTK2/GTK3/Qt/etc. -- we can
shift all that pain onto Matthew, et al. :)
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