[CJefferson]

I can believe that, my problems have always arisen when people want to transfer to another device, or access from two devices at the same time.

I know such things are possible (it works for me) but many people get themselves in a horrible mess.

[GekkePrutser]

Using it from 12 devices now.

But yes the client validation and key exchange is something non technical users don't grok :( Even though they've clearly spent a lot of time making it as easy as possible.