LTI Pro-Blackboard Bad Request

[CRB]

We are starting to see again, when students click on the LTI Pro integration in their Bb course site they are getting a "Bad Request" page that comes up. It is very similar to what we saw last spring when students were getting a similar "Unauthorized" message when clicking on the tool link in their Bb course. We have looked into the browser Enhanced tracking within Firefox but that doesn't seem to fix this new "Bad Request" issue and it also seems to be happening in Chrome as well.

This is

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500 - v=2.0;clid=aw1;rid=INT_5db65704cde11f41

Any ideas on what might be happening or what we should be looking at.

the error code we are getting.