hello again!
The jumper in the thermostat id there to join R and Rc. This is only necessary if the system has air conditioning. Since this is heat only you can leave the jumper out.
HVAC Mechanic
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The thermostat terminals i refer to are on the furnace control board. This is where the jumper fell from. The terminals are R,Y,W,24 com and G.
is this the board you put in?
http://americanhvacparts.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=CIB011057&Category_Code=