Hi Darin,
I'm not sure if I have the exact same version of the Flow Control steptypes as you, but when I tried editing/configuring the Do-While step type several times over and over again I could not cause it to throw any error. Go to the following link and download what we have on our website and replace the steptypes that you have with these (I just downloaded the ones listed on this webpage and tested your scenario with them):
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3E9AF56A4E034080020E74861&p_node=DZ52236&p_submitted=&p_rank=&p_answer=&p_source=External
Let us know if reinstalling the steptypes fixes the problem or not. If not, perhaps you could post a small example sequence that utilizes the steptypes you have so that we
can check to see if they are the same version and try to reproduce the error with a sequence you generated. Thanks!
Jason F.
Applications Engineer
National Instruments
www.ni.com/ask