Intel 520 240GB freeze after running Intel SSD Optimizer

e56imfg

Distinguished
I've been running my 520 (400i) on my new system for months without problems. But after I installed Intel Rapid Storage Technology (AHCI), I get this one minute freeze on my desktop after I run Intel SSD Optimizer inside Intel's SSD Toolbox.

I tried disabling/ enabling buffer flushing but no avail.

Help?