UBB.Developers Forums UBB.threads 6 V6 Modifications Forum Design Integration UBBThreads/Photopost Integration Version 2

I have integrated this modification on my main site and it works like a dream.

However while trying to integrate it on another site I get the attached image. Both sites run the same versions of UBBT and PhotoPost and also Beyond Compare reports that all files are identical.

Any ideas anyone?

Thanks