HELP ... submit score and rankings problem

Hi,

Just upgraded both vbulletin to 3.6.2 and arcade to 2.5.7+

Whenever a game is finished and tries to submit score, index.php won't show or shows a 404 or blank page. However scores *are* saved!

I do have vba_cmps, but it's in a different directory - it's in my htdocs root, while the forums and arcade are in forums/

I get the same not found error when trying to see my rankings or a member's scores.

any suggestions? TIA!

ETA: sorry there's one more thing, I have *one* member who claims she can't get into the arcade at all (gets the same 404 error), she's using IE7