OpenEuphoria

Could you try using the %x, %g and %f formats? Maybe also try poking it into memory, and peeking it out to see what it looks like. Since the '?' operator seems to give the correct result,

This value is suspicious, because the -2147483648 is 0x80000000, which is the mask that euphoria uses to identify a sequence.

I'm on XP, and I haven't found a way to duplicate this (it's a build with MANAGED_MEM turned on, BTW).

Matt