[b-kandor]

Anytime I try to resume a render that originally had alpha checked (i.e. black background) - the resumed render ignores this setting and shows the environment background (hdri in this case).

Is this a known bug?

Thanks,

b-kandor

[Bubbaloo]

Work around:
Create a solid black image in PS, open it in mxcl, save it as an mxi, and put it in the background slot (leaving your hdri in the other slots). Re-save the mxs and it will resume correctly with a black bg.