alert! soundtrack pro is running out of resources

hello friends,

I keep getting this message after doing a few edits in STP:

Alert! Soundtrack Pro is running out of resources. it is recommended that you save your work and relaunch the application.

I thought this may be due to too many programs running at once, so I shut everything down, did a restart and still get this message. I did just run system updates and there were a few program updates -- Safari and a couple others, I think.

Here are my system specs:

Processor 2 x 2.8 GHz Quad-Core Intel Xeon

Memory 32 GB 800 MHz DDR2 FB-DIMM

Graphics NVIDIA GeForce 8800 GT 512 MB

Software Mac OS X Lion 10.7.4 (11E53)

thanks for an help you can offer.