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When using version 1.0.1 of the iOS app it is not possible to edit question that have tags with only one character (e.g. c or r). After clicking Submit the user is thrown to the tags page and the following error popup is displayed:
As the screenshot shows, for some reason we had a requirement on the app-side that at least two characters were required. Clearly that was wrong, so I've removed it.
The fix should be available on version 1.0.2