Howdy,
I downloaded 1.11 on first day of released, then on another day.
I saw various exchanges on Stack letting me think that this version got hotfixed in the following days for various small problems, and that one of those hotfix just messed up the grouped_date function.
Is it now safe to download and upgrade?
Hotfixing has never be a good idea. I had lot's of problem with EE in the past. I guess I am not the only one, so you should ALWAYS bump the version.
Thanks