PortableApps Firefox issue with Win10 1903 and SB 5.31.2

Hello,

Sandboxie 5.31.2 and Windows Windows 10 x64 bit 1903 

Latest Firefox Portable (PortableApps)

Windows Defender

New sandbox with default settings

"SBIE2224 Sandboxed program has crashed: firefox.exe"

 

I had no issue working with the latest PortableApps Firefox (installed inside a sandbox), Windows 10 1803 and an older version of SandBoxie (sorry I can't remember, it was 2018).

Now, I upgraded my Windows 10 to 1903, I upgraded my SandBoxie to the 5.31.2 and cannot start Firefox anymore.

I create a new sandbox, installed PortableApps inside the sandbox (correcly), installed Firefox Portable (correctly) but when I start Firefox I have:

"SBIE2224 Sandboxed program has crashed: firefox.exe"

I also tried to start the ".exe" from its folder with the same result.

Please HELP