Adding another sametime community

I’ve got the following problem on both my windows and my mac 8.5 clients. I’m unable to add another Sametimecommunity (which I’d really like).

I’ve found this in the forums, but that doesn’t resolve my problem, the option is still grayed out. http://www-10.lotus.com/ldd/nd8forum.nsf/DateAllFlatWeb/615562630d1a48ad852575080079386e?OpenDocument

I’ve set my stpolicy.nsf to allow for multiple servers to be connected, but still no go (after reboot etc)

Does anyone have any suggestions?