DXERROR err=UNKNOWN:-2147024809 87

Anyone know what this means? I got it just now when attempting to switch from fullscreen to windowed mode.

There's some of the debug data on the side. Would be nice if there were some way to cut and paste it all...

No, but Google (Good old google!) links to two pages on this site :-)

Here and here.

Quite a few google hits including this and this

Snap !

Ah, nevermind, I've just noticed that I accidentally saved over an old version of my app handing code with a new set of code which was incomplete and so is trying to set a window sizes which is 0x0 pixels.