Can't see bottom of window?

[John Whitmore]

I'm running GnuCash 2.6.14 on OpenSuse Tumbleweed and Gnome

I can't get GnuCash to sit inside the physical display. It's displaying below
the bottom of the actual window so I've no idea what's down there. I can't
move the window up past the top edge so bottom edge just can't be reached to
resize. I'm not being allowed to maximise.

Has anybody encountered that and what's the fix?