So far I've tried:
Running both RSU and RuneMate with OpenJDK x86, OpenJDK x64, Oracle JRE x86, Oracle JRE x64, the X64 JRE that is packaged with the RuneMate linux install script
With both binaries as root and a non-root user.
I have tried using both i3 and XFCE also.
None of this has...