I tend to complete a batch of processing/corrections and then leave PL running while it Exports-to-Disk.
I have noticed a few times now that if I return to PL, after it has been left idling in the background, the Local adjustments tool-interface “disappears” - - and the only way I’ve found to get it back is to stop & restart PL.
What I mean by “disappears” is that I can select any one of the LA tools (Control Point, Grad. Filter, etc) and the corresponding placement icon appears - - BUT, when I click on any part of the screen I do not get the interface for the selected tool.
I cannot demonstrate this with a screenshot, as there is nothing to see - - that’s the problem !
I’ll be doing a lot of new processing in coming weeks (on images I captured during my recent trip to Sri Lanka & India) … I will take note and get back to you on this issue.