Doug is abundantly correct on this one, this is not a Sketchup forum and we all know this. This is a developers forum and this developer has chosen his path. Given that there are easily one billion factors through which we may be better able to help, the responsibility is on us is to not take ownership of his project. In order to support developers, we must do so. If his chosen path is not appropriate, we need to explain in detail why and what alternatives to follow. In order to do that, we must examine his work, his procedures, in a way he sees fit to share. An allegory is to have come to a doctor for advice about a discomfort, only to be told one must run a battery of intrusive tests before anything can be determined, while it may very well be indigestion.
The answer is quite simple and basic and will reveal itself in due time, or as soon as Doug has access to the file. The op is correct in his intuition that it is a Sketchup problem and there is nothing to be gained by viewing the model in Google Earth, MCX or anywhere else mentioned, except possibly to validate the advice. Apologetically, I can't be more specific, I have definitely encountered the issue in my many explorations with all versions of Sketchup, I don't remember the exact cause and can't specify a solution. If the op does not want to upload his model, I endorse his self determination and can offer a few suggestions. It is almost certainly an issue related to texture, you need to review your texture mapping procedures.
The suggestion that it is caused by model size is because of a previous issue with software that edited your model unintentionally, that does not edit smaller models in this way. That software was the Ground Polygon Wizard and that solution does not apply here. You appear to be using multiple textures, which could lead to issues. Sketchup in particular is very accomodating for importing image sources to use for textures and this can cause trouble for those unready for it. It is a good idea to export all these textures from Sketchup, examine their format and make them all match. replacing textures in an active Sketchup file is very easy to do and if you haven't done so, I recommend you familiarize yourself with the procedure.
I am guessing that the problem is as simple as having a .png format image file, mixed in with other .jpg's. Now this is only a guess, but it does seem familiar and it is something that Doug would recognize immediately if you let him examine the file, as would Gary, if he could bring himself to follow your path.
