Three files not found showing in server log

Basically after installing, my server log is showing "File does not exist:" for three files:

public_html/menu_open_usercss.gif
public_html/menu_open.gif
vb/arcade/games_score_php.php

The two gifs are from varous referers, such as
vb/holdsession.php?act=arcade&do=play&gameid=4
vb/index.php?act=Arcade&do=newscore

I looked for menu_open in my vbulletin files and found it in clientscript/vbulletin_menu.js
It should be prepended with IMGDIR_MISC so I assume that is not defined properly for some reason.

The missing php file seems to be happening as a result of something tetris.swf does...
Since tetris is included by default, it seems that the php should be as well.
If worse comes to worse for that one I was thinking maybe I could just make a dummy php file.

However I'd like to solve these things the right way... Any ideas?
Thanks!

[mmblz]

i've determined that the menu_open related errors occur from other vbulletin pages as well, so that just leaves the games_score_php.php error.
another almost identical one is vb/arcade/games_score_sql.php - but that one appears with no referrer...