Setup: Hudson 1.328, cppunit plugin 1.1

The CppUnit plugin seems to be having problems with reading xml results files
when running on a slave node. I'm seeing the following errors show up in my
console output:

[CppUnit] Recording of the CppUnit tests results.
[CppUnit] Processing 1 files with the pattern '_cppunit.xml'.
FATAL: remote file operation failed
hudson.util.IOException2: remote file operation failed
at hudson.FilePath.act(FilePath.java:672)
at hudson.FilePath.act(FilePath.java:660)
at hudson.plugins.cppunit.CppUnitPublisher.getTestResult(CppUnitPublisher.java:246)
...

The full exception stack trace is attached.