You mentioned Overbridge; did you also upgrade OB when you upgraded to 1.30? There was a new release of OB as well.
Have you tried disabling OB and running the DT stand-alone? You mention disabling it as a troubleshooting step but don’t mention if you tried just using the DT by itself without your Mac.
Ok, so the folks at the beginning were correct! Thank you again! Make a back up in transfer. This will take A WHILE. in addition, BE SURE to drag and drop the digitakt project file from the right hand side of transfer to the left, your computer. Then, factory reset it w FUNC + 3. After reboot, drag and drop back in all files from backup. Mine got a little glitchy on screen for a moment but then continued on just fine project intact. THANK YOU FOLKS SO MUCH!!