FSX acceleration catapults won't hold

[navalaviatorwant2be]

This used to not happen, but now it does. When I get in the red and white box of the catapult, I get the blast shield up and catapult armed (holdback bar on lower left as well), but when I open up throttle, I get off it. It doesn't shoot me off, I just get off and continue rolling, it does not hold me back at full throttle like back then. Any idea whats wrong? I tried deleting the fsx.cfg file but that didn't work.

[Daube]

Yes I have occasionnaly the same problem.
I think it's linked to the performance, if the performance is not stable enough then the catapult system gets imprecise, and it releases you.
Try setting the FPS limit a bit lower ?