Choppy VU Meters and -9128 errors with Digirack Plugins

[ekimshaff]

I'm running Pro Tools LE 7.1.1 through the Mbox 2 on a Mac Pro, Dual 2.0 ghz quad core Intel processors, 3 GB ram, and it's running on OSX 10.4.8. Anytime I try to use any of the Dgirack plugins that have a VU meter in them like compressor, etc. I cannot get a smooth reading from the built in meters in the selected plugin. I also sometimes get a -9128 error saying I'm running out of CPU power. This happens even if I only have 1 track and 1 plugin being used. I have my CPU usuage set all the way to 95% and buffers set to 2048, even though it runs smoother at 1024. I've tried various buffer configurations and gone through every step in the troubleshooting thread. Does anyone know what the prpbem might be?