Generally if answers are hard to find then that means we don't consider them ready for proper use. This is true of rend2 and the JKO version which are both incomplete and is why neither of them are mentioned often. Reason being that if people use it and find bugs, you start getting a lot of people trying to report the same bugs and it then becomes difficult to find the useful reports. If they're obvious bugs, we will generally find them when doing quick test runs. For crashing to desktop, start a new thread here and someone should walk you through getting some more useful information out of the crash.