I need to do every time double login
The first time it switches to empty
and the second time held the Login

For the same problem I have complaints from users

I've done some settings wrong;

username for test

pass


a33.gr

I've tried many ways, ..portal login versus login page, login button versus enter button, username with correct caps-use versus username with wrong caps, IE9 versus FF (both 64 and 32 bit editions), but I can not replicate what you say

EDIT: maybe you can try deleting cookies in your browser?

yep, clear your browser cache and cookies

login to your site works fine also for me  

Thanks for your test
I guess the problem is with me only.
I Log In with 3 nick.
One as admin, as mod and as a user, to be able to do the test.

Before I bother here I have make clear cache and cookies.
Even with Ccleaner
But I had this problem and could not figure out what's going on.

Thanks and Solved

Adblock plus on firefox blocking cookies probably ? (or assimilated). I can't think of something else but a cookie matter not saving correctly for unknown reasons. Have you tried with a different web browser to see if it's from your main browser or with all ? Have you changed the path of the cookies recently on your site ?

oou yes...
Alway I tray with all browser before asking (mozilla, opera, chrom, safari, IE and iPhon)...

No I have not change the path of the cookies