Why do I get a redirect loop (302) when using path-auto patterns on taxonomy terms? I am using pathauto to set up my URL's at the moment and they are working fine for nodes.
However when I set up a rule for taxonomy terms using [term:name] as the pattern I end up with redirect loops.

Can anyone explain why this is and how to remedy.

Thanks for any help.
It seems to have been due to caching and the rebuilding of the alias table.  

Once I left it for a while and cleared caches it was working as expected.