Check leaf key usage failed in certificate

I have an applet, embedded in a web page, that worked fine (and still works fine) on machines running Java 1.4.2 and below, but throws an exception on machines running version 1.5.0_0x. Specifically, I get the following exception and stack trace:

java.security.cert.CertificateException: Check leaf key usage failed in certificate

at com.sun.deploy.CertUtils.checkUsageForCodeSigning(Unknown source)

...

I'm totally new to signed applets, so I have no clue what "check leaf key usage" is or why it failed in the certificate. I also can't figure out why it didn't fail in 1.4.2 and failed in 1.5.0. Does anybody have some ideas how I can get my applet back up and running?

Thanks.

--Jay

[731 byte] By [kempshalla] at [2007-10-1 13:54:16]