Very dangerous territory to play around in if you are not experienced and if you don't have a configuration backup, but you can fix the problem by hand-editing the config.xml file in /conf. So before you do anything else, go to DIAGNOSTICS > BACKUP AND RESTORE and create a configuration backup.
The pertinent section looks like this in the file: (note that yours will be different as you have different widgets enabled)
<widgets><sequence>system_information:col1:open,interfaces:col1:open,log:col2:open,services_status:col2:open,nut_status:col2:open,snort_alerts:col2:open</sequence></widgets>
The code deciphers as follows – you have the widget name followed by the column it resides in on the screen and then a value to indicate if the widget is "open" or "closed" (visible or hidden). The fields for a given widget are delimited by colons, and the widget entries themselves are delimited by commas. Fine the errant widgets, delete them from the <sequence>element key, and then save the edited file.
Bill</sequence>
