Loses diagram when I zoom in

[Chris Green <cl isbd net>]

I have a diagram that I created after zooming in so that I created it
on an approximately full size A4 page in landscape mode.  I.e. I
started by zooming in so that one page was most of what I could see in
the dia window.

I created a diagram on the screen like this and saved it.

When I open this diagram now it seems to open in a completely
unscaleable and rather useless format.  It opens in a small window
that shows just the one page in landscape mode and says 'Zoom 1%'
which is complete rubbish.  The scroll bars don't work at all and
I can't zoom in at all.  In general whatever I do I end up with a
totally black window.

What on earth is going on?  Dia used to be a good program.

-- 
Chris Green