Could you try this debugging Macro?
TEST Workspaces Safari Window Restore v001.kmmacros (33.4 KB)
It just opens this Keyboard Maestro Forum in Safari and resizes the Window to a dimension. It uses the same procedure as my Restore Macro. But it does it in steps, with a confirmation as each step completes successfully. If you run it and click "Continue" for each step it will either complete successfully or it will fail at a certain point - which might pinpoint what is not working on your system the same as mine. There are some pauses in the Restore (waiting for Safari to be fully open etc) and maybe one of these pauses is causing the macro to hang on your system. Running this test Macro on my Mac restores the Safari Window successfully.
I am beginning to suspect this might be a regional issue as this part of the Macro pauses until certain menu items are available and these Menu Items might be called something slightly different on your system. If that is the issue it will be easy to fix I think.
click to show image
