When trying to open the SMARTDAC+ GM10 Web screen, security warning "Run this application?" appears and operation slows. How do I keep this message from appearing? I'm running Windows 7, Java version 7.

It is possible that the expiration check is failing.
In Windows Control Panel, open the Java control panel. On the "Advanced" tab, under "Perform certificate revocation checks on," select the "Do not check" option.