"The memory could not read" on iPC Hog2

Hello,
I have a problem with my iPC Hog2.
Often, this message windows appears :

WholeHog II (1): tnt_pc_v3.exe - Application error

The instruction at "0x004a4f11" referenced memory at "0x.......".
The memory could not read.

I must restart the iPC.

I reinstall all the system with the lastest version, but it's the same problem.
Often, the proble moccurs when I patch a fixture.

Best regards.
Zgrand
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