Different Behavior WebGL with Full Exceptions vs. Explicitly Thrown/None

Update: I had a beta version of Chrome. Downloaded latest regular version and it's fine. Not a problem anymore thanks.

My Unity project runs fine in the Editor and runs fine when Full Exceptions are enabled. However, when I enable Explicitly Thrown or None for Exceptions the game seems to compute some math incorrectly. Are there any common reasons I can look for why this difference exists? I tried putting a bunch of Debug.Log statements to track down where the math is computed differently but at first glance it doesn't appear to be a stable place where the computation goes awry.

Thanks for any suggestions.

Update: it appears to work fine on Safari and Firefox but not Chrome. Using Unity 5.4.0f3. Investigating further.