Update: I upgraded to the latest version of the plugin, which stated in the tech notes that it was to fix this very issue. It did not. The registered layout drop down would still disappear. Like johnny59 I was able to select different layouts by usin...
This problem is happening to me too. Using Print Studio Pro after going to File...Automate... in Photoshop CS 5.5. In PSP, I click the "Registered Layouts" dropdown button, the options flash for half a second, and then the dropdown options disappear....