std.format doesn't want to work

solidstate1991 laszloszeremi at
Sat Oct 16 22:47:09 UTC 2021

When I make this call
format(" %3.3f"w, avgFPS);
my program immediately crashes with an access violation error. 
The debugger out is different between x86 and x86-64.

I've made all sanity checks, so I need some other suggestions.

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