Performance Analyser Doesnt Update

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Okay, thank you for the additional info. I'm able to repro now.
Note to self:

1. Note Titan Engine dV is 2,011m/s in Staging Editor
2. Select Titan Engine and change its Chamber Pressure to 12.50MPa
3. Select Staging again and note that dV is still 2,011m/s
4. Nudge altitude slider off Vacuum and back to Vacuum and note that dV changes to 2,034m/s

@AndrewGarrison Thats odd, the bug is always present for me since I switched to experimental. Pretty much anything causes the bug, changing power cycle, engine size/throat size/fuel type/nozzle type/size.

The engine analysis stuff updates as I adjust the sliders, but the staging in the stage tab and the stats in the lower half of the performance analyser remain frozen. If I add a new engine, it appears in staging but doesn't have a DV or TWR/Burntime value until I've nudged the altitude slider.

I'm not able to reproduce this. What changes are you making where it should be updating the dV?