No element can be dragged on Designer canvas in 6.0.2.ER1. I've tried also other possibilities, but it didn't work. This makes Designer unusable. My env: BPMS 6.0.2.ER1 EAP 6.1.1 Fedora 20
So I tested again and it seems to be Chrome related problem. With Firefox 28, I was able to see new process with default start event on the canvas. I was able to drag new elements to canvas as well. With Chrome 34.0.1847.116 new process is created without a start event. No element can be dragged to the canvas.
It seems that this is an issue of chrome v34. I try this with chrome v31 and Fedora 17 and it works.
Lowering severity. Just one note - I've tried to clear browser cache, but without success.
Reproduced with Chrome 33.0.1750.152
*** This bug has been marked as a duplicate of bug 1088898 ***