Ok, I found another thread with the information:
http://groups.google.com/group/TiddlyWiki/browse_thread/thread/ff1f0a8088401b69

Short answer, for the moment you can't select the option to trust the
UnaMesa certificate forever, or it won't work. Doing a one-time
authorisation allows TiddlyWiki to run.

Cheers, Coopsnakes

On Jul 22, 9:20 am, Coopsnakes <[email protected]> wrote:
> Hi Guys,
>
> I am using Safari 4.0.2 on Mac OS X 10.5.7.
>
> Yesterday I installed and used TiddlyWiki for the first time with no
> major issues. Today I've come back to use the wiki and I am getting
> some kind of security permissions problem preventing me from saving.
>
> When I start the wiki I get a (Java) security error saying the
> certificate can't be trusted. I then get told a Java error (text
> below). The wiki navigates fine, however I cannot save. So what's
> changed over the powerdown/up cycle?
>
> java.security.cert.CertificateException: Your security configuration
> will not allow granting permission to new certificates
>         at com.sun.deploy.security.MacOSXTrustDecider.isAllPermissionGranted
> (MacOSXTrustDecider.java:161)
>         at com.sun.deploy.security.MacOSXTrustDecider.isAllPermissionGranted
> (MacOSXTrustDecider.java:76)
>         at sun.plugin.security.PluginClassLoader.getPermissions
> (PluginClassLoader.java:146)
>         at java.security.SecureClassLoader.getProtectionDomain
> (SecureClassLoader.java:192)
>         at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:
> 124)
>         at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
>         at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
>         at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
>         at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:172)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:316)
>         at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:144)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
>         at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:687)
>         at sun.applet.AppletPanel.createApplet(AppletPanel.java:723)
>         at sun.plugin.AppletViewer.createApplet(AppletViewer.java:1870)
>         at sun.applet.AppletPanel.runLoader(AppletPanel.java:652)
>         at sun.applet.AppletPanel.run(AppletPanel.java:326)
>         at java.lang.Thread.run(Thread.java:613)
>
> Thanks,
> Dave.
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