XPS 8950, SA hangs, Task in progress

I have a new XPS 8950. SA (SupportAssist) 3.13.0 was working fine for the first few days. Run All would run all tests and complete. Now, it hangs after I click Run All, and shows a message "Task in progress.". The problem seems to be with Run All because I can run all the tests individually. When I run Dell Update (4.7.1) it completes and says there are no updates. Any idea why Run All is causing SA to hang on the first module? Get drivers?

Thanks for any help.