🕸Fergus Duniho wrote on Mon, Dec 21, 2015 01:47 PM UTC:
My best guess is that you are reaching some maximum to the URL length. Different browsers may impose different limits, which may explain why this problem happens on one computer and not the other. While the drawdiagram.php query string includes only what is different from
the default values, the diagram-designer.php query string includes
everything from the form and so will be even longer. I could fix that
problem by making the Diagram Designer use POST instead of GET, though it
will then have the inconvenience of requiring you to refresh if you go
back. The one thing that might most expand the URL is the FEN Code,
especially if you use long piece names instead of single letters. If that's
the problem, you could make a set for the images you want to use together.