You may just have to use an earlier save from before they have their conversation.
Its odd that when some people put in setstage commands they don't work. You put it in as
setstage 145f85 200
right?
setstage vms49 200
could work too.
You could also try reseting the quest and since you have the pulse gun it might trigger that far into it again automatically (or that just when you get Euclid's C-Finder) so you can try that scene with them again.