Recently a couple of openjdk packages were updated on my system, and suddenly neither Jtwixt nor JHex will work any more.

Details are at https://forums.linuxmint.com/viewtopic.php?f=47&t=276259

Does anyone else have the same problem? I sent an email to Ignatius J. Reilly AKA Kevin Walker, the software's author.

The boardspace.net jar file is flaking out on me as well. I emailed Dave Dyer about it.

I changed my Java from openjdk to Oracle, and all three applets are working again.