After upgrading to version 2.6.6, I am not able to sync any collection, neither individually nor using the new “Sync All” button: the app gets stuck showing “LOADING Sending updates to server …”. The “piano keys” keep moving, so it is probably not dead, but there is no way to stop it other than to restart the app.
Update 1: I find that downloading collections does not work either, getting stuck on “Generating download…”.
Update 2: Trying “Sync All” (Danish from Spanish) about one hour later, it got stuck on “Updating collection undefined (1/2)…”. After a restart, the “Sync All” button was gone. I can’t really tell whether the sync was actually performed or not.
Thanks again for letting us know! It was an issue with our server that should now be resolved, and we’re working to get a fix in place to prevent it from happening again. If downloading or syncing gets stuck again or you notice any other issues please let us know.
I tried “Sync All” today after playing one of my 11 downloaded collections in the Finnish from Swedish course: it got stuck displaying “Updating collection undefined (0/11)”, and I had to restart the app. After that I just synchronized the collection I had been playing, without any problem.