Re: Simple SEO URL [support thread]
You should not use html extension, it was there to support people who switched from other modules, but in fact it doesnt help at all with either seo purpose or user friendly purpose.
Regarding the links, I wondered if you have cleared the SSU cache after you upgraded the new version.
If you clear cache and if that solves the issue, you can try to enable link alias and auto alias to see links without identifiers inside, remember you will also have to clear cache again to see the effect
I no longer provide installation support on forum for all my modules. However, if there are real bugs with the modules please feel free to contact me