Same problem for me!
I'm getting the same message -
"Unable to edit your database with the provided user credentials. Please make sure the connection user has write access to this database. (You may need to upload the connection to the server if you have made changes recently.)"
...when I attempt to set up my first "Add content to Power CMS".
I've set permissions to 777 on the "Connections" folder.
Using Dreamweaver CS4 on Mac OS X 10.6.8. Using Fasthosts for this site (but it seems from other posts that the issue isn't with the hosting).
Only bought the Super Suite a few days ago so a bit of a WebAssist newbie! Any help would be much appreciated.