Getting "Invalid page context" exceptions after upgrade to 15.1.12

[magosk]

Hi again. Just wanted to mention that I will be out of the office again for much of next week, so a reply from me could be delayed several days or even a week. I could also mention that I tried calling WebApplication.RunParams.Clear() in FormCreate (after reading the run-params). This gets rid of them in the browser bar but does not help against this problem.

Also, our maintenance logs has now shown a few more places where we get the same error. All these involve url parameters, but are not using the explicit redirect that we use in the test program (that duplicates case 2). 

Best regards

Magnus Oskarsson