Since JRE update 6.19 I have been receiving a warning about signed/unsigned mixed code when accessing an applet from a browser even though the applets contained only unsigned classes. After installing 6.20 the warnings have stopped. The warnings are apparently false.

I'm concerned about users encountering this problem with applets I have deployed. Is there a bug in 6.19 that was corrected in 6.20? I can find no mention of this anywhere on the web.