We recently upgraded to Workbench 4.5, and ever since then, whenever browsing to a dataset job & clicking on the "Source" tab, workbench takes an extremely long time on "Verifying Transport Settings".  While this would happen on 4.0, it was never longer than a few minutes.  But for example, yesterday I was stuck on this screen for at least 15+ minutes. 

For troubleshooting I restarted workbench, the domo workbench service, the computer itself, but always it gets stuck on this screen.  Already this morning, with completely different datasets it has been stuck for 20+ minutes at least 2-3 times.

Why is this happening now, anyone else having this issue or been able to resolve it?