Markers in FusionTablesLayer not clickable after layer is refreshed at same zoom level

[fred]

I created a layer of markers out of FusionTablesLayer in map api v3. When user clicks a marker the infowindow is brought up allowing user to update the attributes of corresponding row. The infowindow is created by layer's click event handler. Default infowindow is suppressed. After update the layer is deleted, recreated, and event handler is re-bound to new layer. At this point I expect user is able to click the marker to see updated data. However, the maker become not clickable at current zoom level. User has to change zoom to click it. I know fusion tables tile is cached. Because the underlying data is deemed to be volatile, I have to use a random number in the query's where clause to effectively disable caching. If not, the maker is clickable at current zoom level but data displayed in infowindow will be stale. 

Is there a soution? 

The site is available at http://db009963.th.gov.bc.ca:8081/dbcpws/input/index.php. 

Click a marker and select one of the link in infowindow to increment or decrement the witness count column.