Dizkus

hi,
i've been running pn.726 for the last few months.. and everything has beene running smoothly.. untile recently..
now, whenever i try to install a new module...
(1) the admin part does not show up on the admin menu
(2) the module initialization does not create the tables the module needs
(3) when i try accessing the module admin via its URL, it says xxx fields missing in DB

I initialize and activate the module as usual, after regenerating the module list.. and the module never gives an error while initializing....
i have tried - zclassifieds, userpoints and wherebis. all are giving the same errors - now i'm worried about trying to installl any new module in case the site goes down.. it is an active site with almost 800 members.. (http://www.rddreams.com)

any ideas?
thanks