On my FIDDLE, you pervs. ;-)

I just changed strings about a week ago, and there's a weird thing going on with the G. If I tune it to where Mr. Snark the Tuner says it's in tune, and I double-stop it with the D, which is also in tune, the G is obviously NOT in tune, even though the tuner says it is. If I tune it slightly flat, then it sounds fine with the in-tune D.

If I isolate the G, it sounds fine in the beginning, but the tone clearly goes slightly flat as it resonates. I've never had this happen before and I'm flummoxed.

Any ideas? Thanks. :-)