We’re having an intermittent problem with edit locks. Occasionally someone wants to open a window but cannot, the error message stating that another user has it open. However, the other user closed that window several minutes before and has since saved. The only way to release the edit locks is to close the Designer. We haven’t been able to find a repeatable sequence of events to make this happen reliably - with a number of developers going in and out of numerous files it’s proving hard to track down.
I have attached a screenshot showing the edit locks for a particular Designer - this was despite there being no windows open in the Designer at all.