after cloning my j2.5.14 website from another host, worked OK, I carried out a Joomla upgrade to 3.1.5, which imported little but the __content table. I then wiped public_html and did a clean install of j3.1.5 there, eventually I changed the _menu, _users etc table suffixes to the one I adoted for J3.1.5 ie j3_ and the site worked fine, I re-installed cb 1.9 and old CB users could log in; I registered a user from front end: could log in fine.
This is all on a "development" site but one I wish to go live on asap, the CB logins have become broken on the j2.5.14 Live site and I could not find the reason, but I am only slowly re-adding only the most essential functions on J3.
I was offered an upgrade to j3.2 by the host of this "dev" site, and also cb 1.9.1 so why not? The result in respect of the lack of logins is now been seen by many people, and me.
My PHP version is 5.3.27 and I suspect that its installation started many of my problems on 2.5.
I just ran SELECT * FROM `j3_users` WHERE PASSWORD LIKE "%{SHA256}%"
-no results
For $2y there are 2; the Administrator (not his real name) and me - neither can login to front end but then I have just reverted to CB 1.9 and now changed these two passwords. I can confirm that a font end registration worked fine too on CB 1.9 and I will now wait developments.
Trevor
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