missing faces on smd model I've been working on a bunch of models lately but when I went back onto Blender a day later for some reason this has happened



It happened to all models I've made, the faces are like they've been deleted by themselves. I tried to look for hidden faces and nothing happened.

I compiled the model into the source engine and the model looks fine, tried reinstalling Blender, system restart from yesterday and still nothings changed.

Is there a way to fix this that doesn't involve individually filling in the faces?
When importing make sure you select these options: