graphs not being created and wants to download graphs.php

[OrbWireless]

Most of my graphs are being created, but some are not. For the ones that are not being generated, if I click on the graph name under graph management it asks me to download a zero byte file named graphs.php. No errors show in the log, and I'm stumped. I have set up 1 minute polling according to techbots posts and that seems to be working sweet.

The one the won't generate is [Interface - Traffic (bits/sec, Total Bandwidth)]

The ones that are working are anything under [Mikrotik - Wireless -]

Where to look?