(facepalm)
I've sent a note to the particular developers and QA. I'm going to have to put a hold on any further data-based tweaking until v1.1 since obviously we're not doing a very competent job of testing our data tweaks.
Data tweaks alone are mostly harmless, IMO.
It's code changes that don't maintain compatibility with old data that are problem. Like for example when num_shards field out of blue became real number of shards instead of shards+1. Sure you can change damage formula in XML files to match it, but it breaks old saves (since they rely on old XML data).
Also, I really don't see a reason why creature abilities or things like ranged bow attacks needed new min/max value tags. They should have kept old ones, with old code in place to properly interpret them just as in 1.07 or earlier. And only spells should have been tweaked with new values. That way, changing spells wouldn't make it possible to break something else.