Hi Lieve,
Thank you for your response. I did see your article mentioning it - you have excellent Google visibility when it comes to Captivate. It's a shame that you're one of the only resources though - and Rod of course(I know you're out there too). It seems pretty bizarre to me that Captivate gets consistently released with out-of-the-box functions that don't work, and support is pretty limited. I can generally find a way around them, but it always adds a lot of time to my projects debugging only to find that the problem is Captivate's and not mine... not ideal. Makes me wonder if Adobe is forcing annual releases regardless of where their Cp dev team is at.
In this case, the same On Exit function that failed in my responsive project did work when assigned identically in a standard/blank project - so at least in this one case it's not a general "on exit doesn't work how I want" issue. I'm not trying to execute anything that needs to happen ON the slide being exited, I just need it to execute - at some point. I determined that all manner of actions do work in my project for On Exit: I can increment variables, show and hide objects, etc etc - the only thing that fails (and it fails 100% of the time for me in responsive projects) is using navigation as part of advanced or shared actions, whether Jump To Slide and other slide based navigation, or GotoFrameAndResume or other frame based "micronavigation" (thanks for giving me the initial tip on that, by the way - it's served me well).
Unfortunately I couldn't add the action to my On Enter for the subsequent slide, since in my case I need my On Exit function to kick users either back to the beginning or to the end slide in the project, so if set at On Enter they would never get to see that slide's content. I did end up doing something similar: adding brief 'redirect' slides in between my content slides, which have the same function set On Enter. Seems like a dumb work-around to me, but my JS solutions weren't behaving well and I've had enough debugging.
If you feel like it I would appreciate if you could verify whether it seems like a bug to you as well, and maybe even whether it persists in Captivate 9 (I think I recall you having that). I always get nagging doubts that I'm mucking something up I just haven't found yet, though this one does seem like it has nothing to do with me. Thanks again.