This can affect Spinner.com users as well as RealAudio users. You probably need to switch your transport mechanism to use HTTP.

• Launch RealPlayer and select View>Preferences.
• Select the Transport tab.
• Select "Use specified transports".
• Click the "RSTP Settings" button and select "Use HTTP only" then click OK.
• Click the "PNA Settings" button and select "Use HTTP only" then click OK.
• Click OK.

That should solve the problem.