I have the following problems with the way Joomsef 4 works on Joomla 1.7. I have embedded weblinks in an article:

-The full URL is not displayed in the status bar, only the category or menu link (although the weblink actually takes you where you want to go)
- Joomsef insists on using the menu item name for weblinks categories if you have it set, even though you set the menu item to off in the extension parameters in Joomsef
- Like before, Joomsef insists on 'weblinks' in the URL
It seems I will need to do some hacking of the extension code.

I also have an issue with uncategorized articles:
- Uncategorized articles get 'uncategorized' inserted into the article and it seems must be specifically filtered out (this differs from the way it worked in Joomla 1.5 if memory serves and is unwanted behaviour)