Sorry about the trouble. I have identified the problem. Digital TV channel scanning was broken. It will be fixed for the next release.
And by the way, MC listing 4 tuners for your device should be correct behavior. I though you meant 4 digital tuners, and thus raised question of whether there is something wrong with the driver. The device should have two hybrid tuners, meaning two tuners that can be used either as digital tuner or as analog tuner. When you running channel scanning, you are to select one of the two digital tuners to perform the task.