"Live cannot access the undo history file and is switching to a memory based undo"
The following message is an indication that Live cannot write the undo file due to two instances of the same version of Live being open simultaneously:
"Live cannot access the undo history file and is switching to a memory based undo"
In addition to this message, as of Live 12.1, the following warning message will appear to inform of the possible loss of data:
To resolve this message, first restart your computer. If the message reappears after the restart, follow the instructions provided below to troubleshoot further.
- Close Live
- Locate the files Undo.cfg (Live 8 and earlier: Undo folder) and Preferences.cfg, and move these to the trash.
To find these files, navigate to the following hidden folders. Here's how to access hidden folders.
Windows
\Users\[username]\AppData\Roaming\Ableton\Live x.x.x\Preferences\
Mac
/Users/[username]/Library/Preferences/Ableton/Live x.x.x/