It looks like that since one of the last update ()not sure!), JoomSEF is generating duplicate urls for categories incl. RSS and ATOM urls. Example

1. sef url = contact-info > real url = index.php?option=com_content&id=106&layout=blog&view=category&Itemid=932
2. sef url = contact-info > real url = index.php?option=com_content&id=106&view=category&Itemid=932

Both urls point to the same category. URL nr. 1 contains 'layout=blog'. SEO-wise nothing goes wrong except from the fact that the sitemap contains a double url that is pickup by Google.

If I delete both, empty cache, both will appear soon again.To avoid duplicates with RSS and ATOM urls I already added the 'format=feed' in the field 'Do not SEF URLs matching regular expression' in the content extentsion but I assume this is not how JoomSEF is supposed to work.

Anyone an idea what I could do to prevent duplicate urls in JoomSEF? Is it config? I experience this on 2 different websites by the way. Both Joomla 2.5.17 and JoomSEF 4.5.1 (1 is the paid version, the other is the free version).