I have installed the suspect problems on the link you sent and intend to use the same inputs and seeds to try and duplicate the error with the latest update of Webwork.
One small hitch is that our canvas tech left early for the weekend and so we may not be able to start testing the LTI connection under V 2.15 until she returns on Monday.
I hope to have some positive results to report on then.
Thanks for your fast reply!
Tim