Hi all,
Since the 26th of April, Google modified the GoogleDocs forms posting method to enforce the usage of HTTPS instead of HTTP.
This is the only change between 3.1.1 and 3.1.2.
Google decided recently to move most of their services from http to https, so the change had been anticipated and tested as both http & https were active until monday.
It is actually possible to use https with ACRA 3.1.1 using formUri instead of formKey, but releasing a new version of ACRA for this specific change was the better solution as it won't require any change to your usage of the library. Just switch the jars and release a new version of your app.
Sorry for the inconvenience,
Kevin