I too am having this issue across MP all of a sudden.
Tried repairing, uninstalling, and reinstalling all the C++ software,
tried reinstalling DirectX,
tried DCS cleanup and repair,
tried deleting and swapping "_protect.dll" files,
tried Run As Admin,
tried removing UH1 module,
etc.
No luck...
specs
• Intel i7_5820k CPU
• ASUS X99 Rampage V Extreme Motherboard
• Corsair 64GB DDR4 Memory
• Nvidia GTX 1080 Ti 11GB GPU