I decided to stop development of ROXTerm for various reasons (the work
needed to fix this bug being just one of them). It wasn't in a fit state
to be in Debian any more so I had it removed, which is why the latest
available package (frozen at jessie) is older than the one you had
already downloaded from testing or unstable.
The old GTK2 version will continue to work, but all GTK3 versions will
have this problem which was caused by a change in GTK 3.20.
Another developer has volunteered to fix this bug, and has made a bit of
progress, despite the messy code and being unfamiliar with GTK. If he
manages to get it into a usable state we might be able to keep it
ticking over.
