If you import a SketchUp collada file then export it, using the default save options you get a Assertion failed error from the visual C++ runtime library. I was using MeshLab to resave the collada file, because starting with SketchUp v7 a SketchUp collada file even though it's collada complient cannot be loaded up in a gaming engine. I attached the assertion filed error dialog box. This only occurs when exporting to collada from a collada import. If you import from a non-Collada file, the error doesn't occur when exporting.
assertion failed error dialog box