Anyone using TC Electronic MD3 or VSS3 with PT7 HD

[guitar012001]

I just recieved my 10 day licenses from TC today for MD3&Brickwall Limiter, and VSS3. I only downloaded MD3 to the iLok I use for demo plugins to try first. However, I've been trying it on my Stereo Master and everytime I start tweaking the Brickwall Limiter Pro Tools crashes. So, is anyone else using this plugin? I'm currently at Pro Tools 7.1.cs4, HD5 i.e. one Accel and 3 Process cards in a 7 Slot Magma Chassis and a G5 Dual 2.3ghz with 4.5gig of ram. I used MD3, Brickwall Limiter, and VSS3 with a previous PowerCore Logic Native rig and they sounded and worked great. I really want to purchase and use them with my HD rig and Pro Tools but these plugins are very expensive for HD and TDM. So, if they're not functioning ok with Pro Tools I'm going to stay away from them.
Anyone have any experience?
Randy