My setup:
OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.20634 (Git)
Build type: Release
Branch: master
Hash: ba34cc6a96c15d64224e8f0c8b5da874f1e03a07
Python version: 3.6.8
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/United States (en_US)
I have a model where I've been making changes and needed to replace the tags on the edge profile (user label 'cutout') used to cut out the workpiece. There are a few problems:
1) The 'copy from' menu doesn't work at all: a) There's no 'don't copy' option; or b) It wants to copy from the currently open operation. And the associated replace all button either is disabled or doesn't do anything.
2) Having lost my tags, I clicked on the bottom path wire to manually place a tag and get the following error:
Traceback (most recent call last):
File "E:\Dev\FreeCAD19_Output\Mod\Path\PathScripts\PathGetPoint.py", line 207, in pointReject
self.pointFinish(False)
File "E:\Dev\FreeCAD19_Output\Mod\Path\PathScripts\PathGetPoint.py", line 187, in pointFinish
FreeCADGui.Snapper.off(True)
AttributeError: module 'FreeCADGui' has no attribute 'Snapper'
Traceback (most recent call last):
File "E:\Dev\FreeCAD19_Output\Mod\Path\PathScripts\PathGetPoint.py", line 211, in pointAccept
self.pointFinish(True)
File "E:\Dev\FreeCAD19_Output\Mod\Path\PathScripts\PathGetPoint.py", line 187, in pointFinish
FreeCADGui.Snapper.off(True)
AttributeError: module 'FreeCADGui' has no attribute 'Snapper'
and at this point I can't do anything: the 'save' and 'close' buttons at the bottom of the dialog do nothing, and the usual OK/Cancel/Apply buttons at the top of the dialog are disabled.
I've attached the problem file for your autopsy pleasure

Frank