Login problem for admin - need a full reset -

• Consistency
• Error
• Regression
• Usability

After 8.1 installation, I need a long time to be able to login as admin (not tested till now for other, two many problems to solve, test are programmed).
I was upgrading data from 7.2.

In fact the lonely way needs all these steps :
- clear all local cookies
- clear caches of server (temp/cache; module/cache)
- reinit as new (tiki.sql and some complements as the length of passw is we don't change the admin pass, no object, the SQL import file reset admin user and checks admin configuration)

Then when you login admin admin you are normally asked to set a new password, as for new installation. Everything seems OK, it is not true.

__If you quit the browser you will be reconnected automatically even though "you have not checked remember me".

__

But if you quit, for example to login for test with another login (the reason why for dev I don't check remember me) and try to reconnect you get "Invalid login or password" 

No other solution than a full reinit of admin login.
__
I checked :__

• clear local cookie alone : no result
• clear only tiki caches : no result
• clear cookies and cache (the db data are good for admin identification) : no result
• clear cookies, caches, reset admin as new install : OK

Work around

No idea.
I had many problems with cache and PHPSESSID cookie, with devs, someones are immediately taken in account other needs to clear caches and sometimes (prefs, evolution) PHPSESSID which seems to have priority on new values after changes in prefs.
Changes in soft and css are immediately taken in account changes in prefs made by admin interface no particularly when they concerns modules.
Changes made directly in database, on prefs or modules parameters obviously need a clear of caches.
Where is the problem ?. I am quite sure that I could find it, but as I don't study this part of soft it should take to much time.

!!Solution ?

This bug has been demonstrated on show2.tiki.org

Please demonstrate your bug on show2.tiki.org

This bug has been demonstrated on show.tikiwiki.org

Please demonstrate your bug on show.tikiwiki.org