[SOLVED] Upgraded Evolution and can't login to Manager (JS alert)

Thought we’d post about this because it took us ages to figure out...

We upgraded an older 0.9.x site to Evolution 1.0.5, on IIS. After a successful upgrade, when we tried to login to the Manager we got a Javascript alert "Location: [site address]". You could manually go to a Manager address and you’d actually be logged in, but was a real pain for the client (obviously).

SOLUTION
Upgrading on IIS put blank spaces at the end of the config file (config.inc.php), after the closing PHP tag. Open the file, remove the spaces, re-save, problem solved!

And THAT is exactly why many experienced PHP coders do not put a closing ?> tag at the end of their .php files; it technically is not actually required.