I'm sure these are so obvious you must be aware, but.. I couldn't find in Gemini and still seem to be current on this site so..:
1. Notification emails have bad links:
eg I get link like this in forum emails from this site which are just badly formed (no slash before default.aspx):
http://www.dotnetnuke.comDefault.aspx?forumid=10&tabid=795&scope=post&threadid=3609#3609
both in the click here to go to message board links and in the base tag applied to the message:
2. Can't get back to post from link
I find I get a prompt to log in, but after logging in, instead of taking me to the page I was trying to view, I get taken back to the forum home page, and have to navigate around to find where I was which can be a painful process.
I hope this is useful,
Jonathan