Since upgrade to WeBWorK 2.16, I experience a strange behavior when using WeBWorK from Moodle via LTI):
Using a Gateway Quiz works as expected (so, I can navigate between questions, the timer is running, it gets graded etc.).
Using a Homework Set (no matter if the user is a student or professor in WeBWorK), immediately after following the link in Moodle, the WeBWorK page loads in an iFrame inside Moodle and shows that the user is logged into WeBWorK (and the list of problems is shown, as expected). However, then clicking any link in WeBWorK logs the user out of WeBWorK and shows the login page for that course prompting the user to enter username and password (the latter of which the user does not have).
I suspect that I am overlooking some configuration here, but nothing I tried has helped so far. Any help/hints/suggestions would be greatly appreciated.