How about server paths url to the forums all this is correct under the options? There has to be some difference here in how they are setup. Please check and let me know
On the one that shows broken images what is the path it shows?
If the server path it is looking for is the same as nitro have you considered possibly PHP openbase_dir restriction which will not make them usuable across domains?
No, I didn't mean they were exactly the same, as in I am not using the charger path on the nitro forum. But, the structure is the same. Therefore it should work.