Closing and reopening browser got rid of sql error message.
Multiple problems with Search:
When select list comparison value was "itemchecked" it didn't work, but checkboxes did (all checkboxes are <name="CheckboxGroup1" id="CheckboxGroup1">
When select list comparison value was changed to name of select list (news_select) the drop down worked, but not the checkboxes (no results found)
Checkboxes have never worked as a group.
Textfield search has never worked at all (no results found or all results from table).
Viewing page on remote server shows an odd 'table doesn't exist' message.
FTP credentials are in private message and file attached.
Lastly, DW crashes repeatedly when accessing the Search Wizard. The only solution I've found is to edit one item at a time, closing Wizard after each edit.