cannot retrieve action item definition

Question

Using version R36.45, Quicken Deluxe, Windows 10, for the past couple of weeks, I get the above message when I try to switch to Accounts Receivable from the Taskbar. Same behavior as reported in closed thread: https://community.quicken.com/discussion/7894541/cannot-retrieve-action-item-definition
 I have done everything suggested, and also removed and recreated the icon on the taskbar, but the problem persists.  I can get to Accounts Receivable by clicking on it in the Accounts list, but the icon on the taskbar yields the error message and does not pull up Accounts Receivable.
 Please advise.

Chris_QPW · Answer

Boy did that jog an old memory.  :)

Boatnmaniac · Answer

And here I was thinking I might be giving away my age!  LOL!

011ver · Answer

Oh dear, is my age that obvious? Going along with my father to the hardware store to test tubes when banging didn't work was always a favorite outing!
 In my defense, I had exited Quicken and rebooted it a couple of times yesterday...but maybe there was a process lurking that got a definitive shutdown during the backup. THAT's a good takeaway, to use Task Manager to make sure all Quicken-related processes have really been shut down. Tx/