merging/updating profiles in show

How do I merge/update new fixture profiles into an existing show?

I tried merging the new fixture library in, and it showed that it was a new revision, but once I finished the merge, the profile still did not work. I had to create a whole new show file to get the new profile to work correctly, it was still using the old version even after I merged in the new profile version to my show file.

Am I missing something?

Thanks
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