Slitherine

I have attempted to install a new graphics card and encountered problems. Have now reverted to my original card but FOG is failing to load. Last message from game:
NullPointerException
1.5.3 2011 05 02 win
{}
{o}
uiplayer.htk.GraphicsArea.Paint
o uiplayer.htk.GraphicsArea o
uiplayer.gl.l Graphics
uiplayer.gl.DrawingArea.Event Render b o uiplayer.gl.DrawingArea
Delegate.lM Invoke
uiplayer.htk.RefreshThread.Event
Run o uiplayer.htk.RefreshThread Can you help?

It's a problem with patch 1.5.2 and 1.5.3, but the the game should run smoothly if you simply open it again after the error.

It's also in the Tech forum.

Thanks and hoping to fix in version 1.5.4.
Keith