Hi, In the meantime, I found the real reason: a broken GTK2 "oxygen" Engine (as hinted already by the stack trace... d'oh). After switching to qtcurve, the issue disappeared.
Sorry for suspecting the wrong package at first, Alain On 11/05/2016 13:33, Debian Bug Tracking System wrote: > Thank you for filing a new Bug report with Debian. > > This is an automatically generated reply to let you know your message > has been received. > > Your message is being forwarded to the package maintainers and other > interested parties for their attention; they will reply in due course. > > Your message has been sent to the package maintainer(s): > Christoph Goehre <ch...@sigxcpu.org> > > If you wish to submit further information on this problem, please > send it to 843...@bugs.debian.org. > > Please do not send mail to ow...@bugs.debian.org unless you wish > to report a problem with the Bug-tracking system. >