Derek has said that problems such as glowing models (and indeed very bright textures in TSX Mode as well as legacy mode) are down to mistakes by us amateur modellers and that cannot be argued with. Although we model and distribute our models in good faith because they worked OK in Rail Simulator and RailWorks, it is unfortunate that we have missed the important settings to ensure that they work OK in the future.
But hang on ... they DO work OK in TS2012 TSX mode and do NOT glow in that mode, it is only the legacy mode that is the problem
What do we do
In practice it is possible to change the settings in the GeoPcDx files and re-upload them to the library but it then means that everyone who has used those models and those routes would have to re-download them all again and not just my models but all the models from all the Train Simulator sites around the World where everyone has made the same error. And all of this just to make legacy mode work correctly in respect of glowing models which can only be seen in night time scenarios anyway.
I have no idea if this can be fixed in the core program but it seems that RS.com are not going to try even though there are probably large numbers of people having to use Legacy Mode and seeing glowing scenery at night when this did not happen in RailWorks 2.
It is difficult to criticise RS.com when this is entirely their product and they perhaps feel that they have no responsibility to external content creators who are really just tagging on behind, but they do provide the tools for content creation and a certain amount of technical information so there must be some responsibility to those of us who take the time to create content for their product that others can freely use. I am, however, certain that at this very point in time the team are working on fixes and I hope the support line will not stop at the minimum necessary level and extend into the moral responsibility level as well.
I have only mentioned glowing models but the same principle applies to all the other problems with Legacy mode that others have mentioned in this thread.
As I have have said before, Derek does the best he can for us but this is not his responsibility or fault.