It is running on an ubuntu 14.04 system.
Last night and this morning I was unable to add problems to a problem set in the END1021F_2015 course. The problem set is Area and I was selecting problems from Rochester/setIntegrals19Area from the OPL directory. The Green highlighted bar appears saying that 1 problem has been added to the set but the set remains empty. This didn’t happen when I filled my other problem sets.
Here is another example of the problem: