Alright i'm not a complete newbie when it comes to the geck but for some reason when ever i load an interior into my render window parts of it are missing leaving me to do guess work? Anyone have any idea how to fix this?

There's a bug in this version of the GECK regarding Room Markers. In order get around it you need to change the value for the "bUseMultibounds" in your GECKCustom.ini file. Set it to 0 not 1.