If I open a map in Hammer, every single prop from that map is loaded and seen. However, I am unable to add anymore models to the maps. The model browser just says no .mdl files in almost every single directory. The only props I can use are some rocks from props/wasteland and one or two other models from certain folders.
I have refreshed the SDK content several times, but this did not fix the issue.
Has anyone encountered this problem or knows a possible cause/solution?
I can map without props, but brush-based trees are hard to get right...