Pulling my hair out here, help please? Been trying to run some new cars, so switched digital chips. Everything was running fine but only with red controller. Have been through and tried to pair cars with other controllers per the ARC Pro set-up guide, using just the powerbase section. I get as far as car lurching forward, solid green light under the corresponding button on the powerbase but controller still does not make the car go after that. All of the cars will respond to the red controller but none of the others. So, I know the cars work. I appear to be able to 'pair' something, but thereafter, nothing. What the heck am I doing wrong?