To begin with, I have not done any FS2004 design. Having said that, some years ago I created a bunch of FSX sceneries and with that my own Library with the Library Creator X (2.0.4) and it worked fine, the models were all FSX models (I repeat). Today I tried to read my library and it showed all my objects in RED, now all the objects have their GUID empty and if I try to re-insert it with the same model it says it is an FS2004 model or so when it is really an FSX model (I repeat I have NEVER created FS9 models and I used them before in FSX in my FSX lib). So, why is that? How can I fix that? If I need to re-add them I will need to preserve the GUID to the one I had registered before or all my sceneries will be broken and will be a pain to go through all the objects.