As reported by @makeworld-the-better-one in #487 (comment):

I was able to add a folder to the public test grid which I couldn't do before, clicking the Folder button is what would cause the crash.

Unfortunately when syncing the folder I got another crash. I assume this is a different issue but I thought I'd put it here in case:

Traceback (most recent call last):
 File "twisted/internet/defer.py", line 1660, in _inlineCallbacks
StopIteration: [{'relpath': 'test.bin', 'mtime': 1655386477, 'last-updated': 1655386492, 'last-upload-duration': None, 'size': 4096, 'path': '/home/makeworld/tmp/gridsync-tmp/test.bin'}]

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
 File "twisted/internet/defer.py", line 1660, in _inlineCallbacks
StopIteration: [{'relpath': 'test.bin', 'mtime': 1655386477, 'last-updated': 1655386492, 'last-upload-duration': None, 'size': 4096, 'path': >'/home/makeworld/tmp/gridsync-tmp/test.bin'}]

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
 File "twisted/internet/defer.py", line 1660, in _inlineCallbacks
StopIteration: ('gridsync-tmp', [{'relpath': 'test.bin', 'mtime': 1655386477, 'last-updated': 1655386492, 'last-upload-duration': None, 'size': 4096, 'path': '/home/makeworld/tmp/gridsync-tmp/test.bin'}])

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
 File "gridsync/gui/usage.py", line 406, in on_total_folders_size_updated
 File "gridsync/gui/usage.py", line 330, in _update_info_label
TypeError: converted_batch_size() missing 1 required positional argument: 'value'
[1]    137184 IOT instruction (core dumped)  ./Gridsync-no-pango.AppImage