https://bugs.freedesktop.org/show_bug.cgi?id=91656
--- Comment #14 from christoph.rabel@gmail.com --- This was just posted in PoE forums regarding this issue:
----- Reported development thread on official forums here - https://forums.obsidian.net/topic/82875-the-map-is-not-displayed-correctly/
Also, please be aware of this thread, which details Mesa rendering issues and a current fix regarding the driver - http://forums.obsidian.net/topic/82667-rendering-issues-on-linux-now-theres-... -----
Since somebody already hacked a fix, developers should be able to come up with a nice fix soon.