Emmanuel:

Last night I did some further testing.

When I run SH3D-jnlp I have the problem described above: I can draw walls, but that's all.

When I run SH3D-normal I don't have any problems.

When I first run SH3D-normal and, while it's open, start SH3D-jnlp, than SH3D-jnlp runs normal as well. Only difference is that SH3D-jnlp runs slower.

When I close both and then run SH3D-jnlp again, it behaves normal, albeit slow.

If I restart my computer and then run SH3D-jnlp again, the problem returns.

With SH3D-normal I'm referring to the installer-version and SH3D-jnlp is the version that installs the icon to the desktop.

I hope this may help you in narrowing down the problem.

Hans