Doing a FQuat*FQuat when one of them is a parameter-by-value in non-debug builds causes access violation

Development Platform & Builds Debugging, Optimization, & Profiling
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Here’s a really simple code project that reproduces the error when built alongside the current Github 4.5.1 source:
zipped project via dropbox

I just placed the code from the OP into the GameMode, calling it in the GameMode’s constructor.

Looks like the assembly mnemonic I mentioned above is an SSE instruction, hence why it would only show up in an non-debug build (I’m presuming that debug builds don’t use SSE).