Aborting a paused print can result in strange things

[andersolsson]

If you pause a print and abort it in the paused mode, the platform and print head remains in the paused state.

If you now go to the Advanced-menu, "lower platform" and "home head" will not respond and if you select "move material", something strange will happen.

The situation can be recovered by selecting the print menu instead, the head and platform will then home.

[illuminarti]

I was just coming to report this as well... I got a report from a customer stating:

"Start a print, pause the print, while it’s paused, abort the print. The head won’t home and the plate won’t lower. If you go into the Advanced menu, the “Lower Plate” and such won’t do anything, and “Move Material” will send the plate crashing into the head."

[daid]

Tech details, the pause adds a M601 (custom for UM2) command to the queue, which handles the pause. As the pause is never aborted, no other GCode commands will be executed, but some menu functions bypass the GCode and control other code directly, which is causing the problems.

Fix is quite simple, which is to disable the pause flag, at which point the GCode reader works again.