Help with fs2004 panels

All the 2d panels in my aircraft have suddenly gone huge so I can only see
the top left corner, but its only the image - I can still hold my mouse
pointer over where the panel should be and get the correct tooltips. When I
try resizing the panels they get to a certain size (which is till too big)
and then I can't grab the edge anymore. I haven't installed any scenery or
aircraft recently and I haven't changed the fs9.cfg file. Does anyone have
any ideas on why this is happening or how to fix it? Thanks.

Rob