Could not insert term into the database

Having the exact same problem. Was happening before upgrade to 2.6 but message was: “Something strange happened, try refreshing the page”

Still not able to create Categories!!! Please help!

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I was having this issue, and it turned out the problem was that WordPress’s database user didn’t have sufficient privileges to do all the things WordPress needed to (mostly during upgrading, like creating and dropping tables).

After I gave the user enough privileges, I forced a database upgrade and my missing categories came right back.

Hope that helps!

I has this issue but for other reason. I was upgrading from and early version to 2.6.2. The first thing is reading the upgrade log in the main directory… there′s a error_log file on the root of the website.

I got a problem with the latin1 charset of the database, the upgrade script doesn′t recognice the collate and gives and error, then the new tables of this version don′t get created.

The fix: comment the lines that refer to latin1 in wp-config.php and redo the upgrade process. All works fine then.

Another reason for not being able to create records is that the AUTO_INCREMENT is not set correctly for some reason. You can change this by executing the following SQL

>ALTER TABLE tbl_name AUTO_INCREMENT = <thenumber>;

For thenumber you would pick one higher then the highest value in the primary key field, which you can get with

>SELECT MAX(fld_name) FROM tbl_name;

do this for each table to make sure.

You can check the value to be used next using

>SHOW TABLE STATUS;

I was using DB Cache plugin, I deactivated it… and that fixed my problem