continued...although maybe I spoke too soon!
I'm getting Out of Memory PermGen errors shortly after I log in then get booted off. Maybe lack of memory issue on my server computer? I only just discovered that Tekkit launches with 3GB of memory allocated which might be pushing things...however without MCPC+ Tekkit has been running fine.
I was just trying this for the first time, but using the latest Tekkit 1.2.8e builds for Server and Client + the recommended MCPC+ 164 build 236 and it's working fine for me so far. Any versions of MCPC+ past that failed once a client logged in.