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1. Only a few. No matters the account. It happends when getting to my website after a long not connected period with cookies from "remeber me".
2. Tested with Opera 49 only (Yep Chrome and Opera uses Chromium toolkit)
3. Because it happends with cookies this not happening in my case.
4. My webhost do not use any cache or cdn. All data is generated and delivered on each HTTP/Ajax request.
Yep @vrijvlinder is true embeding is not best choice.
To match a theme, the easiest is to use the embed theme and put all you want aroud.
That's what I did here:
(It's not embeded !)
The main problem of the iframe is mobile.
It's a pain to use Vanilla throught embed because Vanilla will load mobile theme in, and you will loose all mobile benefits.
And the Popup works strangely in iframe.
I think you must check if mod_rewrite is enabled because as I know it's not always default enabled with xampp.