Hopefully this is the right forum thread for this and thanks in advance for any help.
I noticed that the Mach and shock heating effects seemed to become transparent when they are in between the camera and the ship. Not sure if this is a bug with KSP or caused by a mod.
Screenshots:
http://imgur.com/gallery/6Ugko/new
Some of the mods (texture and visual effect related) I have installed are:
64K
FAR
N.A.N.A. Wildfire
Destruction FX
Stock Visual Enhancements
Scatterer
RealPlume - Stock Configs
Dynamic Texture Loader
Texture Replacer
Kerbal Krash System
Camera Tools
Collision FX
Please let me know if there are any other mods that may cause this problem, or if it's just a bug with KSP itself. Thanks again for any help.