hi oxa,tim
i have been using the Backing Multi-Link Doubles plan and i think i have found an error in your conditions, thus stopping the addup from working as it should.
the trigger , increasing add_up
IF(counter=1, 0 etc
your condition
global , last_won/lost amount is greater than 0
the IF(counter=1, 0 , cannot work because the condition is wrong, so the addup never goes to 0.
your condition should be
global , last_won is greater than 0
and in your block condition
OR selections trigger expression counter is equal to 1
then again maybe i am going stirr crazy
mcbee