Ground not rendering?

I have no clue what the FUCK is wrong with my garry’s mod. i’ve reinstalled, updated drives, everything. this is gm_constuct_snowday_2009, the normal construct works last time i checked, but also this happens on flatgrass. some one please help me out? thanks

Perhaps it’s the custom map breaking it? It’s most likely caused by a leak, check if your friend is able to run the gm_construct_snowday_2009 map or not. If it’s not the map it could be something to do with your hardware.