>>>>Had this in the last 4 days:
>>>>was logged in in FF,
>>>>looked something up on tablet without logging out on PC
>>>
>>>Do you mean you switch to another device to log also to UT?
>>
>>yes, Nexus tablet with Dolphin browser
>>
>>>
>>>>back on PC my session was removed by second log in
>>>
>>>Do you mean on your original session, the login was no longer recognized and you were forwarded to a login page?
>>
>>yes, login page was shown but after that login the blank page happened. After next login, usual page was shown.
>>
>>FF 43.0.3
>to paraphrase Lutz Schefflers words: Use another browser

As the result would have been the same - why ?