Ranking
First of all this belongs in support.

The most common reason is that your grafics card isnt good enough.
Leader of ORMO||Property of [T]||A replay thread
There's an FAQ thread for this.

http://forum.toribash.com/showthread.php?t=27975

<Erf> SkulFuk: gf just made a toilet sniffing joke at me
<Erf> i think
<Erf> i think i hate you
Hi, kozimat.

First of all, this isn't the right forum for this, The Game is for replays, suggestions, organisations, Bounty Hunting, move teaching...

This goes in the Support forum.

Secondly, the reason that shaders aren't working is because your graphic card isn't good enough to run them.

I suggest either using toribash with no shaders, or getting a better graphic card.

And, also check out this : http://forum.toribash.com/showthread.php?t=27975
Thanks.