Hi Gary,
Yes it can be quiet in here but there are some that can help. For the most part, every version of JoomSEF, I have been able to sort out issues and get it running. Frustrating as it may be sometimes. ;-) So maybe it is quiet because people aren't looking for help that much.
-2 problem is related to the link source itemID. I will be the first to say I am not an expert and I don't understand it completely, but what I think happens is if you have different menus pointing to a page, Joomla has functionallity to identify where the link comes from, so it can trigger mosPathway (breadcrumb links) and related modules to be displayed. I also think is has something to do with the first URLs it reads and builds. I recently had the problem of one link with -2 at the end, and what I did was delete all SEF URLs, cleared my cache and 404 errors and then went to the homepage of my site and it built the URLs again. I had to do that process twice before I cleaned out the -2 address.
I am interested to here if I am anywhere close to correct.
Cheers,
Marcus