I made some changes and asked a few of my coworkers to comment on some timeout values I found configured on their ASA 5510.  In the off chance that you or anyone else on this forum can comment, I'll include the lines I was curious about here as well:...

Thanks for the suggestions.  I just increased the User Idle and ARP timeouts from 5 minutes to 2 hours.  Figure it can't hurt, although it's unlikely to be the problem.   No MAB right now, and I haven't configured a multicast RP or IGMP snooping yet ...

Ben, One of my customers has a 2504 WLC with 5 1602i APs, and we initially have the same problem getting the Chromecast to connect to the WLAN.  Your detailed explanation was extremely helpful in resolving our initial connectivity issues. Unfortunat...