Hi Mark they did some changes to the Forum and your cakewalk account, assuming you have one, that links the sign on to that account. If you go here
http://www.cakewalk.com/About/Email/1 they may be able to help you out with your sign on.
The link problem is caused by the need to have 5 posts befor you can post an active link, it is to help control spam.
You could always just type the link out and the ones with one (me) or more active cells can copy and paste it
Look forward to hearing your tune.