Glo on-off slider without function

Hi,

Finally got round to picking up the new Glo, and am impressed with it, so far.

But: the on-off slider is completely without function. Neither short flicks nor holding it in the off position yield any result.

Software is: 2.1.5 (r43939 10/12/12)

I have the Glo in the Kobo Glo Leather sleep cover. That works well. But the on off switch doesn't at all.

Any ideas?
Thanks