Sandboxied programs don't run in isolated space as intend after Windows 10 Update - 1903 / 18362.1

Hello gyus!


I'm having some trouble to run multiple clients of one game in Steam.

Before the Windows 10 updates to 1903 / 18362.1 the Sandboxie version 5.27.1 worked well for me.

After this update the verison 5.27.1 don't run any application and I receive this messages:

SBIE1222 Error with security token:  [C00000BB / 35]
SBIE1222 Error with security token:  [C00000BB / 36]
SBIE2314 Canceling process Start.exe

So I tried to update my Sandboxie to a newer version 5.30 and 5.31.2.

I don't receive any error messages with these versions but the games that worked before seem not to be sandboxied because the .exe file of my game detects the other that i'm trying to open.

I also removed the updates but the problem still happen.

What can I do to solve that?

Sorry for my english.