I have been using version 4 with 1.6.
First off it seems to clash with JCE, so if you use this editor you cannot get into the configuration of Joomsef. Even though the development team know about this they have not fixed the issue.
Everything worked fine until i tried the print icon which doesn't work at all, Joomsef screws up the link up.
People have made this point on their forum and there has been no support what so ever.
Not happy, I was a paying customer, moved to another SEF plugin until they can fix the bugs.
maybe you could take into consideration it is not JoomSEF bug but a JCE bug. As it works fine with other editors as weel as other JCE versions.
As regards the print link, it is working fine in our testing instance - so maybe you are using different link types in your template?