I just installed AVR Studio 5.1 just to try it. Before I used the 5.0.1223. When I compile my project with that older version and upload to the AVR via JTAGICE mkII there is no problem, the program starts. When I open the same project with 5.1, compile and upload it onto the AVR nothing happens, the program doesn't run. As the Studio has become rather complex, I thought maybe someone experienced the same and can tell me what's the difference or what setting I have to change to make it run.