strange bug with transparent textures

[Noahkinkin]

When i look through transparent stuff, like glass, it appears to see through the walls.

[Fearagen]

Originally posted by Nightmareius:

When i look through transparent stuff, like glass, it appears to see through the walls.

Verify Integrity of your local game files.

Right click Garry's Mod in your Library >> Properties >> Installed Files >> Verify Integrity.
Sounds like something corrupted and this should repair the file(s).

If that does not work then do the following: Check your mods to make sure you don't have anything that would cause such an issue.
Disable one whole page at a time and go into a map and see if the issues persist, if it doesn't move on to the next page, if the issue goes away, you just have one page to figure what the addon is.
Also, might be worth running "menu_cleanupgmas" in console without the quotes to purge remnants of server downloaded addons or whatever else. Remnants like that can introduce problems.

If you do not have a single mod that's being unstable/glitchy then try to Factory Reset Garry's Mod by going to "C:\Program Files (x86)\Steam\steamapps\common\GarrysMod" and double clicking the file named "FactoryReset-GMod.bat". This purges all settings and resets them to factory defaults, so to whatever they were at when you first installed the game and launched it. This means beware of all your custom key binds being gone if you set those up. This does not delete addons making you have to sit and wait for them to redownload.

If you have went through all the steps above and the game is still acting up, try to fresh reinstall Garry's Mod. Uninstall Garry's mod via the steam library, go to "C:\Program Files (x86)\Steam\steamapps\common" and delete the "GarrysMod" folder. (Steam usually does not remove game files from this folder after said game(s) was uninstalled). and then reinstall Garry's Mod, wait for all your mods to download from the workshop after launching, test a map to see if the issue is somehow still present.