channel mapping gone mad in 4.5

[flickapolitan]

using default sttings for channel map i cant drag and drop a clip onto the timeline without it forcing the audio down to an audio track, separating the tracks...this was never the case in 4.03 anyone else having this problem...im looking to get back the situation that i can put my clip anywhere and it stays combined
i dont think i fully understand the channel mapping thing but its behaviour has changed
any ideas....

[antonsvideo]

click the little A on the left of any track and then click clear all tracks

this feature wins the Novel Peace Price for confusing most users, including myself

Edius 4.5 turns this on randomly and I was unable to find what causes this

maybe it will be fixed in 4.54 due in December