Hello :)

A while ago, I set my autosave path to be "/tmp/%s.autosave~" in order to not clutter every directory with autosave files.
Lately (using 7.2.26 here) this seemed to have stopped working, as it now simply appends the absolute autosave path (for testing purposes set to prefs.autosave_filename = "/home/merlin/%s.autosave~") to the file directory (in my test /home/merlin/ for the file /home/merlin/test.ipe).
See also the image below for the error popup I get:

I added this preference mentioned above in a custom ipelet in ~/.ipe/ipelets/customize.lua which gets picked up normally.

Would be great if you can have a look at this. Please let me know if you need more details :)