GW appointments not appearing on Adroid - tasks on win8

We are experiencing an issue with appointments sent from other users not appearing on the android phone. Local appointments sync ok.

For example, someone send me an appointment, which I accept in GW. Does not appear on phone. If I create an appointment it appears after the sync.

Phone is Galaxy S4 running 4.2.2 and the same issues happens whether I use the Samsung calendar or the standard Google calendar app.

We are also experiencing an issue with Win 8 phone - Nokia 920. Tasks do not sync in either direction.

I've updated to 1.2.5.299.

Thanks in advance.
Simon