Did you check the transistion condition after this step? Sometimes if the transition condition is not met the process engine stops there as it does not know where to proceed
Did you check latest fixes? you would find lots of issues fixed in ALL versions about this issue. You need to analize if a current fix already resolves your problem to avoid wasting time. (For this the best is checking empower for PRT/Monitor fixes and take a look to the readme files).
If not enable logging facilites for PRT and Monitor to TRACE and get some pointers.
Thanks your response. I could overcome this problem by creating a new process from the modeler rather export and import mechanism. Not sure of which fix will resolve this problem. There could be a possiblility that we are using windows 2000 server and IS 6.5 with no service packs installed which no longer webMethods support.