Hi, It is not possible to drag track B to become the last child of track A, *if* the current last child of track A has any children. Every time I try to drag something to become a last child of track A, I have to drag it to become *second to last* then re-arrange the track order again. Please consider fixing this, Regards, - lum

Confirmed (5.18 x64).

This has bothered me for ages too, especially since I use nested folders a lot.

I'm not sure if this is the best place to post this, but I'm having an issue with getting child tracks of a VSTi Master to play audio. If you look at track 3 in the .gif, the audio only comes out when the audio lane ( or track ) is under the VSTi. Any time it's made into a child track, the audio stops. My way to deal with this was to create a Master Drum track above the VSTi Master, so I could child track all the audio and midi.

^ Above issue is because Reaper is avoiding a feedback loop, you can disable this in preferences. Unfortunately, there is no way to circumvent this by sending only MIDI one way and only Audio the other, or vice versa, which would be handy for such a situation.

Thanks for the response, I'll just deal with it in this manner then.