They can work together but you have to upgrade the beta firmware regarding the chromecast issue. Ask for the beta firmware here. :) http://ticket.tp-link.com/index.php?/Tickets/Submit

Hi Peter, PA210 and WPA271 are not paired, right? How about status of powerline light on them? If powerline light is not on, follow this guide to pair them. http://www.tp-link.com/en/faq-258.html

What's the operating system of your PC? Download the driver here and try to install it manually. http://www.tp-link.com/en/download/TL-WN751ND_V2.html#Utility Take Windows 7 as an example....

T2U cannot be installed on Linux. They are incompatible with each other.

After upgrade, you should reset it to factory defaults and reconfigure it to test. If the problem continues, maybe your unit is defective.

Any anti-virus software is running on your PC? Disable it. Besides, are you running the utility with the administrator account? (Control panel-->System and Security-->Change User Account Settings)...