Error in <ROOTX11IOErrorHandler>: fatal X11 error


This is no question, but just “for info”, since it took me a day to solve this puzzle:

Summary: Under some (unknown) circumstances, XQuartz 2.7.6 does not work well with ROOT 5.34.18 as well as the latest version 6.00.01 on a Mac with Mavericks 10.9.3 - I had to downgrade to XQuartz 2.7.5.

Using XQuartz 2.7.6, root compiled nicely, but whenever I tried to open a GUI is says:

Error in : fatal X11 error (connection to server lost?!)
**** Save data and exit application ****

This happens even in the ROOT interpreter, when I just want to open a canvas via “new TCanvas()”.

The issue did not happen on a second Mac with simular setup…