Why does Xalan's XPath fail on 1.4 JVMs?

Background: I am developing a web services server using JAXP and JAXM. The server has several filters for checking incoming SOAP messages, one of which checks the validity of XML signatures. This filter uses Xalan's XPath engine to locate XML signature elements in the SOAP message and to pinpoint those elements in the message that must be signed.
Problem: The XML signature filter works very well on a 1.3.0 or 1.3.1 JVM, but fails on 1.4.* when the server is under stress (20+ concurrent requests). I am using the same version of Xalan on 1.3.* and 1.4.* (using the endorsed mechanism of 1.4). This leads me to believe that the XPath implementation uses a class that somehow is not 100% thread safe on 1.4. Are there any classes that have lost their thread-safe-ness from 1.3 to 1.4?
I am a commiter to the Xalan project at Apache, and I'd like to come up with a patch/workaround for Xalan's XPath engine.

we also have a server application that processes XML files in multiple concurrent files and don't have problems with the XPath of Xalan. we migrated to 1.4 several months ago and didn't have such a "signature filter" error. what's the exact error message? exception? stack trace?

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