I am trying to setup a replacement pattern with URL Alias on a vocabulary called 'Media Categories' using the pattern 'media/[term:name]'. However whenever I try and generate the aliases this vocabulary is left unchanged. I have tried changing the pattern to something else like 'edia/[term:name]' and that works, it seems as though it is reserving the 'media/[term:name]' somewhere.
I have tried flushing the cache, deleting the vocabulary and terms and adding them again, however I have still had no success. The only option I have had so far is to manually enter the url alias.
Has anyone come up against something like this before? All I can think of is that 'media/[term:name]' is reserved somewhere...