PL notebook activity stuck in queued

Today my PL that has been working stopped behaving as I expect.

The PL has a lookup that returns metadata for tabular data we are ingesting and has one row for each object. The metadata includes stage specific infomation. The metadata is passed to a notebook (GenerateParams) that processes the metdata and returns metdata specific to an object and its stage back to the calling PL etc etc....

Some background.
Today when I ran for 2 objects (Vendors and Transactions), both objetcs ran as expected for the first stage (Bronze), only one of the objects ran as expected in the second stage. The second object that did not complete, indicated that the notebook it called (LHFS<<FILE>>LHDT_INC_Bronze) was running and that status did not change. A check in the Fabric Monitor showed the notebook had in fact run and completed so I canceled the PL run. I will point out that the Notebook "LHFS<<FILE>>LHDT_INC_Bronze" is not the notebook mentioned below.

At this point I thought some glitch must have occured in "Fabric" that had left my environment in an incomplete state in terms of the subsequent steps that would normally have occured, so to mitigate I tried to re-run the PL just for the Object that glitched. This is where my issues began.
i.e
Now the call to the GenerateParams notebook just stays in queued.
Has anyoine else had this issue and what can one do to solve it?