Rich
I have seen these types off issues since release of v5.1 - in most cases it has been resolved by deinstalling TBC, running the Cleanup Utility and then reinstalling.
A few other people reported also that if you can find that Antenna 32 DLL and copy it into the correct location (it is / was being installed in the wrong location) that that also made the difference - there were some posts on that earlier in the year
Here is the link to the thread (Search "DLL") and it will come up
Alan