"Could not save the project file" message

[James]

If you get this message, please make sure you are using version 4.58 or greater.

There could also be an issue with Windows setting the attributes for the My Viewlets folder to Read-Only during installation.

Here is what Microsoft says.

http://support.microsoft.com/kb/326549

Try saving to C:\Program Files\Qarbon\ViewletBuilder4\My Viewlets

(You should create this new folder)