The last update fix the bug (or the fact I finished the mission after launching with no options have fixed it, I don't know)

I tried without any startup parameters and that's work.

I give you these parameters :
-noPause -world=empty -nosplash -skipIntro -CpuCount=4 -maxmem=8192 -maxvram=2048 -exThreads=4 -winxp -mod=@CBA_A3;@JayArma2Lib;@ACRE;@tao_foldmap_a3;@UUA3a_Scopes;@fhq_m4_a3;@fhq_accessories;@JS_JC_FA18;@Nimitz;@mcc_sandbox;

Launching the mission without these parameters, I had an error about ACRE.

I upload you the .rpt files soon :)

• by "switch from X sight to Y sight" I mean :
• Have a weapon with a "X" sight (for example, an holo) equipped
• Open inventory
• Drag & drop a "Y" sight (for example, an RCO ) on the equipped "X" sight
• Crash ;)

No really reproductible steps. It happened also in the editor, previsualising mission and during multiplayer mission "home-made".

In "pure" singleplayer : no idea.

AppData/Local/A3 files containing dump

https://mega.co.nz/#!qcsxTLyI!QX2mH1KWTd9rOgi4jksgUH0_8O10F81cVobz3cCH6Jg