BQ3050 will not enable charge until SMBus activity

Other Parts Discussed in Thread: BQ3050I have a BQ3050 implementation using four Li-Ion cells. I connect the battery pack to a charger and the BQ3050 will not turn on the charge FET. I found that if I connect the EV2300 pod to the pack for just a second, the charge FET is turned on and everything works from there. If I disconnect the battery from the charger and then reconnect within 10 seconds, charging occurs as expected. If I disconnect for a longer time and then reconnect, it will not charge. Then I found that just tapping either SMBus line with a scope probe will enable the charging. Are pull-ups on the SMBus lines required for charging? I do have them on the system in which the pack gets installed but not on the stand alone charger and not in the pack itself. I have the 200 ohm/100pF/100 ohm network as in reference schematic on each line.