Thanks for your reply and link to the same problem. Inkscape does work if I log in as another user on my MacBook Pro. However, in the post you linked to you also suggest the following: "- shut down XQuartz - go to Library > Preferences - delete org.macosforge.xqartz.xll.plist - restart XQuartz&...

I am running Inkscape on mac OS Yosemite 10.10.3 with latest version of XQuarts 2.7.7 and the display is a strange dark colour and makes the program unusable as I can't see what I'm drawing! All the writing also appears fragmented. See attached screenshot of the display. Any help would be greatly ap...