Mike
This is an unfortunate reality - they do not function properly in Powertracks! And this is applicable for many other VSTi plugins like Jamstix or Waves GTR. You will need to use them in another host as for some reason they are not supported in Powertracks or RB 2009.

This particular request has been on the forum and wish lists for probably the past 2-3 years without luck from PG. A poll was conducted recently to determine opinions on providing a Rewire capability in Powertracks and Realband but we have not yet seen any updates (assuming this would address the VST issues as well?).

Both Reatracks and Realband would be great programs with full VST support but in the interim you would need to use another sequencer (most others support VST).
Roy