I really miss the ability to debug reentrant VIs in LabVIEW real-time. Currently there is no way at all, short of indirect probing by programming your own debug functionality (logging of some sort).
I understand there are inherent difficulties in this, since LV RT systems are typically headless, and definitely GUI-less (except for maybe www-access).
But, maybe if we had a way to send a BD reference to a Host PC, the block diagram could be opened there? Something like an Open.BD method with a "destination" input on it? Then the reentrant VI could open its own BD on another LabVIEW instance running Desktop LV.
CLA and CTA. Worked with LabVIEW from 4.0 to 2010 and counting...