eduard,
thanks for your help, Unfortunately your suggestion does not work either. I have years of experience with Windows PCs and would allways install software and drivers before plugging any new USB device. However, having only few experience with OS X, I followed the instructions of BM Link, which explicitely required to connect the box (and any peripheral to the box) before installing the software.
But anyway, I also removed the software and re-installed it prior to the PC2 with no success. And the box did not work also on my Windows system where it worked a couple of weeks ago and I have made now changes.
francis
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