Beta Editor: Slider moving unpredictably

[bobwillis]

Hi,

v1.10.5

I have used the editor to remove some material in VTS_02 & 04, and now I want to move the 'item reduction' slider so I can reallocate the saved space to VTS_01. I can hold the left mouse button down and drag the slider to where I want it, but when I release the left mouse button, the slider 'jumps' to an unspecified position.

Thanks,
Bob

EDIT: It works fine if I don't remove any material from VTS_01, but if I blank the last chapter of VTS_01 the issue occurs.