Isogen export successfully......NO iso's

I've started having problems today with isogen....whether I use isogenbatch or isogen out I keep getting the same message..

ISOGEN export completed successfully
------------------------------------
Total Plot Files Produced: 0
------------------------------------

It tells me it was successfull but I have no isometrics...can someone please advise me on what is going on? It happens even if I draw just a piece of pipe....I'm confused.

Ramject

dang think I got it .... something to do with a split point...

I have gotten this sometimes, could never pinpoint the problem. Sometimes after being logged on for days it would start doing this. Reboot normally fixed it for me.