What does this mean?

cheater

maybe some weird files in your etmain or etpro dir :x

strange, suggest deleting any trace of et on your computer and then reinstalling first, then start with graphics.

i smell pr0n

It means you have an unsupported marker type.

And that means?

oh noes budha the poodle logged on :O

It's an issue that can come up on any Q3 engined game according to my research, and the error codes can be "unsupported marker type xxxx" where 'xxxx' is a hexadecimal number. Generally speaking, the majority of people seemed to have cured the issue with a clean reinstallation of the game. That means remove all traces of ET from your system and then install again.

Failing that, I would suggest reinstalling your video card drivers as this appears to be linked to the OpenGL API in some way. Hope this helps, if not, at least I tried :)

evo

I found out it was loading server through xfire made it do this. :/