In the picture is shown what works and what doesn't work (also doesn't work for warning descriptions in the code).
Current version Gnome 3.14.1. I tried to change window style settings with gnome-tweak-tool, but it did not change the looks. What else could I try? It worked fine with Debian Wheezy, e.g. Gnome 3.4 (and probably some days ago, before installing the many every-day upgrades coming with Debian testing. -> I'm going to check the aptitude logs.)
Best Answer
It is a well-known issue with Gnome >=3.10. Unfortunately there is no fix or workaround for it yet.
EDIT (link is broken)
Source: http://www.mathworks.in/matlabcentral/answers/125436-why-will-warning-error-messages-not-show-up-in-a-pop-up-window-when-i-hover-over-the-text-in-the-matThe only solution suggested by the answers on the Mathworks forum is to switch off Gnome and turn on some other desktop environment (Xfce, for example.)