In order to change the username on your Auctiva account, you will need to file a support request to get that revised (please include the name you want it changed to.)
http://www.auctiva.com/help/requesthelp.aspx
The link can also be found by clicking the "Help" at the top of the page and go down to the "Customer Support" box.
What profiles were you having problems with specifically? I see the seller details profiles loaded into some of your saved listings, so is it a problem with the Master profiles?
While it is true that our site has experienced a few "hiccups" lately, it's important to note that the updates we have been making are necessary to keep up with eBay's frequent changes. We must stay in compliance with eBay's latest rules and regulations, and that was fairly easy to do when they only made 1-2 major changes in a year. It makes it hard on every eBay third-party listing service when they make so many changes in such a small period of time.
Enough of my rambling!
Good luck with all your selling!
Rebecca