Hmmmm removing TG2 seems to help

Had it installed in another directory to shorten the path for commandline usage. Forgot to get rid of it after I purchased the upgrade.
The spherical camera is much better but there are still some minor glitches. Sample image is the top left corner of a 2000x1000 pixel render. Notes below are for the default scene
- There is still a slight (but greatly reduced) glitch at the zenith and nadir on the left hand edge of the image.
The first column and top and bottom row of the image is slightly darker than the rest of the image.
In a panoramic viewer this shows up as a small dark spot at the zenith and nadir with a thin dark line between them. A levels adjustment in Photoshop changing the white level to 245 disguises most of the line (2nd qtvr, easy enough to automate) leaving the dark spot at the zenith as the most obvious glitch.
No change when render detail is increased to 1