I tried to implement STL export component, and it works by referring to this topic(Export stl files with C# component in GH).
But after export STL, I cannot control grasshopper except scaling with a wheel.
This uncontrollable situation occurs sometimes beside this component too.
I think you need to provide more specific info (full code as implemented, what do you do when, version) in order to reproduce this. At least to me this has never happened.