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Hi Pete, Problem solved. This is a compiler bug. Well, let's say it wasn't specified correctly in the ANSI standard and you wind up with a bug. The details are: long long x; x = 1<<y; will be interpreted by the compiler to mean x = 1 << (y % (sizeof(1)*sizeof(char))); Well, sizeof(1) is 4 since it's an int; so shifts greater than 32 will wrap. That's the bug. The claim is that the compiler errored because it should have promoted 1 to a long long and it doesn't. The same is true in Sun CC as well as g++. This bug has been reported but apparently no one has seen fit to fix it yet (as far as I can tell there is disagreement on what the standard really meant). The solution is to forcibly cast "1" to a long long, sigh. I will fix this and commit. I hope no one coded this in BaBar code. Andy