[copied other reply]
Same problem here. Think i found a solution. Try this. Right click Falcon BMS sortcut, select properties, then compatibility tab and then check Disable full screen optimizations. Then click OK and run Falcon BMS.
Wow! Thank you, thank you, thank you, thank you! I haven’t played BMS for some time now and after installing U5 my cockpit textures were blurry too plus aliasing. Uninstalled and reinstalled BMS completely, fiddled with all kinds of graphics settings but no result. Your solution helped. In other words it was once again the f*****g windows 10 screwing up things. This is clearly a windows thing and not BMS.