The attached problem runs fine the first time I submit an answer. If I submit a second time, a warning appears. This behavior does not occur on the webwork server I am running in my office (version 2.13 webwork2 and pg), but it does when running on the MAA server as:
The 3 tests, one of which is causing the error, are on line 160 of this file.
The warning message refers to "[PG]/lib/Value/AnswerChecker.pm line 252". I have looked at that file but can't
understand well enough to guess why this is happening.
I don't know how to determine the version running on the MAA server. Any advice would be greatly appreciated.