I reviewed the Release Notes for Version 5.4 but didn’t notice anything regarding the compatibility of processing profiles (PP). This seems like it should be a prime candidate for release notes in general.
Via some other posts I have the idea that when it comes to processing profiles the intention is forward compatibility. In that, Version 5.4 can utilize PP created on some previous versions of RT but it should not be expected that the converse would be true. With that said, one would surmise that this is a subject that is unique for each new release. Just because the profiles can/might be changed doesn’t mean they have been. Also it would seem like the backward compatibility could be valid for some cases where the incompatible features have not been used.
It seems to me that something ought to be published on this subject every time a new version of RT is released. Is it possible that this is done but I just don’t know how to find it?