Thanks Charlie, but I don’t think that’s it. My externals are still in 32-bit land, and the "about" menu shows my 6.1.3 as 32-bit.
Strange error wording, too. I didn’t realize that my externals were "shipping" with Max 6.1.3. :-)
Just saw Doug about 2 weeks ago — he was out for a visit. I’ll pass along your hello!