Few things i can think of.

1. The model is too high poly and the engine is having trouble rendering it.

2. You camera is not set to a proper position to view the model.. IE inside the model.

3. After you placed the model you didnt rebuild the level with at least update entitys.

4. An old bug but still may be around. At times wed would append ~something to the end of level names when opening them.

Just look at the top menu bar where it says the name of the level. If you see ~ with anything after it this is likley the cause. Easy soulution is to go to file>save as and overwrite the level, rebuild and try to run again.

Other then this cant think of anything at the moment. Hope one of the above helps.

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