Toggling flashlight causes the map to render out

[Nuts]

Hello there facepunch!
I began working on the map rp_downtown_v4c_v2 for a client (mostly optimization/retexturing), when I came across this really weird issue where upon toggling the flashlight, the entire map will just render out, and all I am then able to see is the skybox.
The compile log shows absolutely no errors, and there are no errors when using ALT+P inside of Hammer either. Does anybody have any idea as to what could be causing this?
Thank you very much!

[Blueberry_pie]

It's probably caused by the skybox materials. Open the VMT files and ensure that they contain this parameter:
$ignorez 1