Microstation Connect Edition Update 10: Problems saving Alpha Channel

Hallo,

saving the Alpha Channel with the "save multiple"-script as an separate Output channel doesn´t work. The picture renders normally, you can see, that the picture is locked while rendering (you can see this in the windows explorer), but the output disappears afterwards. 

We made a special Rendersetup only for alpha channel, because we have no possibilities to save a transparent tiff or png directly over "save multiple"-script. f

Is there possibility to save a tiff orr png with an alpha channel integrated. I think the pass color & alpha should do this. But at the moment that doesn´t work. 

Hopefully someone has an idea how to solve this.

Thanks

Gerd