I've noticed this for a while, but could determine exactly what caused the problem, but now I see the scenario as follows:
Open a stack.
Plate solve only a single image in the stack by disabling "Process Stack":
When the plate-solve is successful and finished, the plate-solve icon stays "depressed":
Clicking on the plate-solve icon to attempt to stop the plate-solve and return the icon to the "undepressed" state results in this error message:
I've noticed this for a while, but could determine exactly what caused the problem, but now I see the scenario as follows:
Open a stack.
Plate solve only a single image in the stack by disabling "Process Stack":
When the plate-solve is successful and finished, the plate-solve icon stays "depressed":
Clicking on the plate-solve icon to attempt to stop the plate-solve and return the icon to the "undepressed" state results in this error message:
