Forum tab missing in groups, and drop-down missing groups in forum posting..

Hi, I’m seeing two symptoms tied in with Forums: When I go to the forums page, I post a new thread, but first,I need to select the group to post to, and to which I am a member. I click on the drop-down list, but it’s empty (no groups shown). Another thing I notice is that the Forum tab is missing in the sub-navigation in the group page (single group) . The sub-navigatoin consists of Home|Admin|Members|Send Invites – but the Forums tab is missing.