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)...

It is normal with the utility for PA4010. The local device won't show up. You can download the utility as below and it will show local device as well. PA4010 can work with it. No worries....

You didn't see what I suggested above? Try to get a beta firmware from TP-LINK support team and test if it works. http://ticket.tp-link.com/index.php?/Tickets/Submit

Hardware version is V2? What's the firmware version you upgraded? After upgrade, did you reset it to factory defaults and reconfigure it. When internet connection stops working, can you login its web...

Hi Jens, internet connection works OK by the switch? What's the operating system of the PC? Tried it on a differnet PC?