Index.php is normal. Just make sure there's not also an index.html file.
Also, make sure the Login page is not in any resource groups.
It shouldn't be necessary, but you could try unchecking the Cacheable status of the Login page and see if it makes a difference.
I'm afraid I'm running out of ideas. What's the action in the form tag on the Login page?
[update] Another thought -- In a browser where you're not logged in to the Manager, go directly to the Login page and, without logging in, do a "view source" and see what the form action is for the Login form. You may need to try several browsers because some will try to submit the form for you. I use IE7 for this.
Also, try taking out the output modifiers in your two chunks and just put a plain text message in the chunks "you are logged in" "you are not logged in". It shouldn't make any difference, but we're running out of things to try.
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PLEASE, PLEASE specify the version of MODX you are using.
MODX info for everyone:
http://bobsguides.com/modx.html
[ed. note: BobRay last edited this post 14 years, 3 months ago.]