Yes, Thalamus, I play a few others PM5 tables without any problem: JackBot, Jurassic Park Lost World, Maverick, Raven, TruckStop... And yes, the only problem I have is with Mystery Castle.
I've just done some others tests...
I'm using "VPinball99_PhysMod5_Updated.exe" to launch my PM5 tables (1734ko). I found another exe named "vpinball-pm5.exe" (1785ko), and as the name and the size are not the same, I supposed it was another version. So I tried with this one. Then, I could launch the ball with the right strength, but it randomly worked.
As I was able to try the table, I noticed that, with this .exe :
- the plunger works randomly. And it seems you have to wait about 15 to 20 seconds to launch the ball
- some various bugs occured... When the ball falls into the hole at the up center of the table, it takes several seconds before its release, and the table does sounds and looks as it is searching for a missing ball. Sometimes, after the loss of a ball, 2 new balls come into the plunger. Some other times, when the game is over, another ball comes out from under the table, and you can continue to play ! Etc...
After these tries, I tried again with my previous .exe, and now "it works" as with the second .exe: I can randomly launch the ball and play, but with a lot of bugs...
I really don't understand what happens with this table ! It's really disappointing, because Mystery Castle is very cool despite all these "mysteries" that happened to me... 
EDIT
I don't know if it has some kind of importance, but I run W10 and the last rev of Sambuild.
Edited by Zedixair, 27 January 2019 - 08:28 AM.