I have an asus t100ta transformer with win 8.1 bog standard, all updates current, no device manager errors, using windows firewall. I have tried changing the registry fix (6.3 to 6.2). Bluetooth Support Service set to automatic. I have also tried updating the drivers, but it says current drivers are okay; Bluetooth radio driver is Microsoft version 6.3.9600.17093 (21/6/2006). no 3rd party AV.

The other device is a nokia Lumia 520 on windows 8. All updates applied.

Items don't connect automatically, but when I click on the connect option on the phone, it connects for 3 seconds then disconnects.

Now one would think using two Windows 8 devices it would be simple. Any ideas?