Well, after tinkering with this for two weeks, trying everything I found in the forums (and elsewhere), I finally just contacted my web host.
They had it fixed in minutes. (It was a minor glitch when the database was migrated over.) Should have started with them.
Having the same problem, here, but only on one of my two sites. Frustrating.
I’m having the same issue, and none of the above has helped. Resetting the plug-ins made no difference, nor did it prove to be theme-specific.
Any more ideas?
