Hey Exo 401 thanks for reporting this, and finding a fix for the transparent issue so quickly!
This is what people should do, if they occur one of those bugs.
If anyone come across these 2 buggs - #1 Missing/transparent lightbar/windows- #2 3d dobbel vision. Fix for nr 1 - ( A bit Complicated) You have to replace your - Gta_vechicle_vehglass.fxc with the current one. So you do this. Find your Common folder, find shaders folder, open, and replace with the vanilla Gta_vechicle_vehglass.fxc ( From a Backup GTA IV) or if you dont currently have. i have provided from mine backup. you can download it here :http://www.mediafire.com/download/lg2bxng50x18uy5/gta_vehicle_vehglass.fxc.rar ( Thanks to EXO 401 from LCPDFR for finding out about this issue) - The fastest and Easiest way for this fix, Provided By British Police Mods! Thanks BPM for this (: This is what you do : Open op the ENBseries (Located in your GTA IV directory) and find this line ( CarWindowGlass) Change it to this [CARWINDOWGLASS] ReflectionAmount=1.0 SpecularPower=20.0 SpecularAmount=1.0 OpacityMultiplier=1.0 Now the transparent bug on lightpars - windows should be gone!! Fix for nr 2. - Disable your night shadows in the ingame options, set it to OFF, and the 3d weird look should be gone.