Can't to add any atrribbute or type

I just upgraded joomla to 1.5.26 version, but, unfortunately, nothing was happened again. Pleace, check again my site. Login, password and access page are the same. Now joomla version is 1.5.26, mootools upgrade plugin is enabled (to mootols version 1.2.5).

Thank You very much for a help. There was a conflict between component J4schema and U24-Lytebox plugin. If somebody has the same problem, must only switch off U24-Lytebox plugin or replaced it by a similar.

Hello, First thanks a lot for your great idea ! I'm really close to buy this usefull tool, because nothing does really exist for that kind of enhancement. (but) unfortunately, I experienced exactly the same problem. After installing your comp, and upgrading everything after reading carefully previous users experience, I get the same screen: root folder, and nothing more Joomla, mootools etc...are at the right version level you described. I don't know what to do more. I really spent half a day to try various things.
If you could help, that could be nice

Waiting for your suggestions...
Thanks.

In my experience:

1. Version of Joomla must be 1.5.26 or older.
2. Plugin "Mootools upgrage" must be enabled (mootools version must be 1.2.5).
3. In my mind, You must disable FTP in Your Joomla site settings.
4. If You will still having the same problem after execution of previous requirements, try to disable most of all used modules and plugins and enable one by one. Maybe there is a conflict between component J4schema and some using extension.

I had the same problem. There was a conflict between component J4schema and U24-Lytebox plugin.

Same problem here We're upgrading our site soon though!