When you write "30." in the session_max_rows input, phpmyadmin will not be able to display any more results. The session spanish message error is "La conexión para controluser, como está definida en su configuración, fracasó." and "#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '30.' at line 2".
When you logout the problem is solved, because the value is saved in the session.
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when you work with phpmyadmin in spanish the decimal value should be "," but i wrote "." and that produced the error. The "," works ok.
This bug was fixed in repository and will be part of a future release; thanks for reporting.