try restarting Synergy and then launching the map again.

I'm also having issues with the textures :c I've tried restarting Synergy and relaunching but it still isn't working.
http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=357323550

ILOVEPIE did you pakrat the map becuase if you didnt that might be why I am also experiencing this issue

Pakrat isn't nessisary when the stuff is in a vpk.

I'm also experiencing that...Similar issues happens on GMod when you don't have CS Source installed...

I have everthing installed all the half life and cs source

have you verifyed the cache of Half Life 2, Half Life 2: Episode 1 and Half Life 2: Episode 2?

Yes

Have you played all of those games since steampipe? have you verified the cache of Synergy?

Yes and yes
edit: went to launch the games to double check and they seem to not want to launch anymore going to fix that problem to see if that is causing the issues

that's probably your issue.

I had the launcher issue and the missing texture issue as well. Fixed the launcher issue and ran up each game fully. Checked to make sure that HL2 through EP2 were mounted and the textures are still missing.

The most puzzling thing is that the ep1 exclusive models and/or ep2 exclusive models are fully loaded and not missing a texture, just blisteringly bright.

So what's the best way to mount Counter-Strike: Source to fix this?

The problem isn't counter strike source... In fact, I don't have a clue about what the problem is, but I'm sure it has nothing to do with CSS. I tried downloading HL2 Lost Coast and mounting it, but it still didn't work.

I'm not sure how modding works but I created some maps a long time ago and I think that if ILOVEPIE tell us what games he has mounted on synergy, we could have a clue...because maybe this missing texture is from another game, and I'm pretty sure ILOVEPIE is not experiencing those missing textures, so he may have mounted a game that we didn't and that's why it's not working for us.