This is a Git pull from 18 hours ago. I assume it is an error with Composr even if I close the browser then reopen and browse to localhost/ it turns it into www.localhost\.com/ and appends 'index.php?page=start' to the end.

Happening on the latest pull from 2 hours ago, only difference being the page= is blank. The URL when hovered is localhost\/index.php (I assumed the browser is adding the www and .com

_config.php has this:-

$SITE_INFO['base_url'] = 'http://localhost%5C';

Just noticed it's being set to that in the installer, see screenshot.

(Click to enlarge)

(Click to enlarge)

2nd screenshot showing homepage error (related to page= blank issue mentioned already). Menu's work, just not the redirect after logging in.

%5C is "\". I suspect you typed the wrong slash when calling up the installer and it propagated. Some things probably recovered from it, others did not.

CMS always enforces configured base URL.

Ah no, I can see it is an issue on Windows. Maybe you manually corrected it before.

Or maybe before your Windows Apache config normalised itself, or was configured to, unix style slashes (which are also web style), as opposed to Windows style.

I manually corrected it once I noticed it was there in the installer. Didn't notice the first time til after the install.

This is still happening on RC8, the installer tries to set the Base URL as http://localhost%5C (noticed it this time and removed the %5C).