I have a problem with saving it as UFO3.

Those are messages that I have:

output:

Traceback (most recent call last):
  File "lib/doodleDocument.pyc", line 199, in writeSafelyToURL_ofType_forSaveOperation_error_
  File "lib/fontObjects/doodleFont.pyc", line 198, in save
  File "/Applications/RoboFont3.app/Contents/Resources/lib/python3.6/defcon/objects/font.py", line 753, in save
  File "/Applications/RoboFont3.app/Contents/Resources/lib/python3.6/defcon/objects/base.py", line 383, in _set_dirty
  File "/Applications/RoboFont3.app/Contents/Resources/lib/python3.6/defcon/objects/base.py", line 221, in postNotification
AttributeError: 'DoodleSingleModeWindow' object has no attribute '_holdFeaturesWhileEditing'

I’ve made some tests, using different fonts. I can reproduce the bug described in the original post: error when saving font in Single Window mode (it’s not specific to UFO2/UFO3). I’ve filed an issue about it in the RoboFont bug tracker.

everything seems to be working fine in Multi-Window mode though…

@rbugden @matthew-hinders-anderson so, you can’t save fonts at all in RF3? there must be something specific to your fonts, or to your setup… let’s find out what.

Is it expected that Robofont will automatically convert UFO2 to UFO3, or is there another process for upgrading UFO files to the new format?

yes, RF3 opens UFO2 files and saves them as UFO3. no other process is required.

I just realized I was confusing "Single Window Mode" with the "Merge All Windows" tab bar option under the "Window" menu.

Once I turned off the real "Single Window Mode" option, saving and upgrading my UFO2 files worked normally.

I do like Single Window Mode, though, so excited for that fix :) Don't know if that's related or not to @rbugden's issues!

In Single Window Mode, I can't save UFO3 or UFO2. If I specify UFO1, it allows me.

thanks!