Kareim:
Thanks!!! It turns out that instead of fully removing the FireRTC Google Chrome extension app (step #4), all I had to do was toggle it off using the little toggle bar (after finding it following steps #1, #2, and #3).
So I don’t know if anyone from FireRTC is reading the posts in this forum or not, but it would appear that we have narrowed down the Incompatible SDP error to being cause by the installation/activation of the Google Chrome FireRTC extension/app.