Hallo, I came across this issue.. I have PDF forms created in LiveCycle Designer with a simple button set as submit type and URL defined. Now pressing the button (in Reader 10.1.2) sends the PDF to a server but while receiving data back, Reader stops working and crashes. In my Acrobat X as well as PDF opened in any browsers, this works just fine. The funny part is that this only happens on machines that have both Reader and Acrobat installed, with just Reader installation, no problem again. Any suggestions?