Since updating to Lion Photoshop is displaying strange behavior. The latest issue is with Merge to HDR. I select the images to process. I click the OK button. The process begins, then the computer shuts off. The program does not crash, it is as if the power cord has been pulled. I have to press the power button to turn the computer back on. I am running the software on a 27" iMac with 16gb of ram.