Plugins apparently are broken in 10.0.6. I have the same problem with Irudis Tonalizer/VFX Pro and with Magic Bullet Looks.
Your system doesn't matter; I run Final Cut Pro X on an iMac 2011 -- I guess we'll be hearing more about this until Apple updates to 10.0.6.1. Although the problem is a real show stopper, especially if you're working on a paying project .
Yes, I made several posts to another thread about seeing pink and green flashes on the screen. I too use (and love) Tonalizer and have been in touch with them. I am using Lion 10.7.5 on a mid year 2011 MacBook Pro with 256mb of video memory. The Tonalizer people said that they haven't seen this on machines with 512mb of video memory, but since it work for me and others before it should work now unless Apple has made some changes and not informed their third party vendors. I'm not working on a paying project, but I am not happy about this.