LM have released a hotfix for their version 4.5. Here's the release notes;
[i][i]Prepar3D v4.5 Hotfix
Client Fixes and Improvements
Fixed performance issues seen on some systems and configurations.
Fixed issue where the interpolated wind direction value would be invalid in some cases.
Added configuration option to toggle UI hardware acceleration mode (UIHardwareAcceleration).
Fixed crash when re-enabling Virtual Reality (VR) while using the Oculus headset.
Fixed crash that could occur in some cases after a plugin removed its textures from the system.
Varjo eye tracking is now supported.
Improved performance when using the Varjo headset.
Fixed issue where CreateEffect callbacks would not be issued unless both xyz and pbh offsets were present.
CIGI ownship ID now set to 0 for versions prior to CIGI 4.0.
Fixed error with empty EntityAffiliation tags being written out in saved scenarios.
Fixed issue where sound volume could be incorrect when switching between interior and exterior views.
Fixed issue where PBR textures could be black in interior views when first entering a vehicle.
Fixed incorrect unit conversions for camera eyepoint altitude P variables.
Content Fixes and Improvements
Fixed missing PBR texture in F-16A.
Removed light scaling from beacon effects.
Scenery Fixes and Improvements
Increased beacon light visibility distance.
SDK Fixes and Improvements
Fixed an issue where the PBRMaterial’s effectFile property would not be updated during load.
Fixed an issue where 3ds Max exports would throw material mismatch errors when P3DMaterial and PBRMaterial were being used in the same scene.
Fixed issue with drawing and loading Annotator vegetation polygons.
Fixed several minor errors in documentation.[/i][/i]
The recommendation is 'Client', but if you want to, do 'Content' and 'Scenery' as well.