Almost everything in gmod has been fucked up in one way or another

Here’s some of the examples

http://www.imgjoe.com/x/csoffice0567.jpg

All the lamps emit no color
Several models have low-quality lighting

http://www.imgjoe.com/x/csoffice0569.jpg

http://www.imgjoe.com/x/csoffice0570.jpg

And then the eyes…

http://www.imgjoe.com/x/forever.jpg

So should I just re-download Garry’s mod? Or is there a specific fix for all this.
(And I do own Garry’s Mod, I have 717 hours on it)