Had to make these changes for best compatibility with MacBook and Apple wireless devices etc...
Change Interface MTU from 1500 to 1476 on WAN interface (may be a cable modem issue)
Select Standard 20 mhz Radio Band for SonicPointN
Uncheck both "Enable Short Guard Interval" and "Enable Aggregation" for SonicPointN
Disable IPv6 on MacBook in order to connect to AirPort Express from iTunes (SonicWALL blocks all IPv6 packets but, IPv6 support is planned for a future firmware release)
Create a firewall rule with TCP Connection Inactivity Timeout = 1440 minutes for AirPlay devices to keep connection alive while streaming media
Use "IP Helper" to enable multicasting (Bonjour and NetBIOS) between wired and wireless subnets
Setup was challenging but it works well now.
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