I am running a MBP 2.66 i7 with 8gb ram, and an SSD HD (boot disk). I am running Lion 10.7.2 and CS5 12.0.4. I have third party plugins, but have the same problem regardless if they are in the plugin folder or not. The problem is that when I try to load filters like, liquify, lens correction or filter gallery on a 16megapixel file photoshop just hangs, and if I wait 10 or so minutes I only get intermittent adobe spinning wheel and apple pinwheel. The dialog box never loads and if I look in activity monitor it says the photoshop is not responding. the weird thing is that this problem just started recently. I have had the exact setup (not exactly sure if I was on 10.7.2 yet, but definitely running lion) and everything worked totally fine. I tried a full unistall and reinstall, I also tried resetting the prefs in photoshop to default, same problem. Just to check I made a new blank document 1inchx1inch 72dpi and tried to run any of those filters and they would load, albeit very slowly, and then when I apply the changes I get a pretty slow application of changes. Everything else on the computer and even within photoshop runs perfectly smooth and snappy. please help asap.