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Here’s one for the public record.
Undefined index: JPG Support in ..../textpattern/include/txp_diag.php on line 364
in the Diagnostics tab on sites running TXP 4.0.6, 4.0.7 (line 367) & 4.0.8 (line 398) – with PHP 5.3.1.
I guess it’s something to do with a change in PHP from “JPG Support” to “JPEG Support” in the GD Library. Doesn’t seem to be causing a problem but I though it worth documenting.