Now it is my turn to have interrupt problems with Studio 6. I haven't tried with Studio 4 so to be honest I can not say that it is a Studio 6 problem yet but I suspect that.
Problem is that if I run in full speed, everything works just fine. But if I single step, global interrupts is turned off.
After a long struggling I finally found that the problem was extremely simple. As soon as I single step using F11, global interrupt is turned off!!!
Using F10 work fine.
I can not even turn it on again manually by clicking in the I/O view.
/Edit. No it is worse. It turns off a little bit of here and there regardless if I am using F11 or F10.