Problem ddraw.dll raising an Access Violation exception... sometimes!?!

Boxx

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In my next MFD, I'm getting sometimes (sometimes none after 15+min of tests) an exception raised by ddraw.dll, according to the C++ debugger. My MFD switches automatically from a view to another, from a vessel to another, and moves the camera based on some computation. It doesn't look like other errors with ddraw reported by @moonheart , @TheDarkDecidueye or earlier. Here it is:

"Exception raised at 0x7A96A999 (ddraw.dll) in orbiter.exe: 0xC0000005: Access violation when reading from location 0x00000004."
Precisions: at the time of crash, no overload of GPU (<80%), CPU (ca. 50%) nor Memory (<500MB), no use of orbiter_ng, no optimization in compilation (debug flavour).

Any suggestion? Possible relevant question(?): if it is a memory problem (ram/vram), is there a way to force Orbiter to purge unused memory?
 
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