Skybox/cubemap help needed

Hi all,

I'm having an issue EITHER with gl.skybox or gl.cubemap, I'm not sure. To put it bluntly, the combination of the two is not doing what it's supposed to. Not even in the example patcher. When I add skybox to a patcher, the render context turns white, as skybox is blank, but when I connect the cubemap with either a @file or a matrix input it turns black and nothing is coming through to skybox.

All I can think of at the moment is some kind of configuration problem in the GPU (Nvidia Geforce GT540M), but I have no clue where to look. The objects worked a few weeks ago, haven't used them in a while.

Any pointers or tips would be appreciated. If you need any kind of log or diagnostics info, let me know.

Thank you.