Invalid argument supplied for foreach()

I updated joomla! from 1.5.6 to 1.5.26
And updated joomgallery from 1.5.0.1 to 1.5.7.5
In the middle of this, I received a screen message that session closed by time out (!)

Everything is working fine, except Joomgallery

It looks like the information on MySQL is not read.
Configuration shows no defaults, and any modification gives error and does not stay.

Previously installed mod_joomimg seams to work ok.
Several errors like the following arrive as you access the menu to the gallery:

http://salvadorcorreia.org/index.php?option=com_joomgallery&Itemid=39:

Warning: Invalid argument supplied for foreach() in /hermes/bosweb/web212/b2125/sl.s#/public_html/components/com_joomgallery/helpers/helper.php on line 925

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /hermes/bosweb/web212/b2125/sl.s#/public_html/libraries/joomla/database/database/mysql.php on line 338

Warning: Division by zero in /hermes/bosweb/web212/b2125/sl.s#/public_html/components/com_joomgallery/views/gallery/tmpl/default.php on line 15

Checked MySQL and it looks to be everything ok.
The pictures are not in default place, that is on domain.net/photo

Can someone please give me an idea of where to look for the originated mistake, or how to solve the situation?

Many thanks

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