infinitest - compiler error and missing dependency

As blogged (http://www.selikoff.net/2009/10/24/product-review-infinitest), infinitest works as expected for one of my projects. For the other, I encounter two errors. I'm not sure if they are related, so I'm putting them both in the same entry. I am using the Eclipse plugin.

This JForum project is a fork of the jforum.net version. I can e-mail a zip/jar of the project if that would help.

1) The JForum project complains sporadically about a class not being found that is in the same project.
How to reproduce:
a) Remove toLowerCase() from line 137 of PostCommon.java. This creates unit test failures.
b) Infinitest correctly identifies two failing tests and marks them with errors in the problems view
c) Restore toLowerCase() which should get rid of the unit test failures.
d) Infinitetest ran 8 test classes including the one with the two failures. The infinitest bar is red however there are no errors in the problems view shown.
e) Project > Clean project
f) Now infinitest shows one problem in the problems view. "NoClassDefFoundError (net/jforum/cache/CacheEngine) in PostCommonTest." PostCommonTest was the class that had the failing test in this exercise.

Note: If I close and re-launch the Eclipse workspace, it starts out clean and I can reproduce this scenario.

2) Infinitest usually finds the relevant tests, but not always. For example, I changed the implementation of post.setText() to use the value "hi" instead of the passed in value. I expected a whole gaggle of tests like the following to run and fail. None of them did.

@Test
public void noCodeTags() {
post.setText("test");
PostCommon.processText(post);
String actual = post.getText();
assertEquals("transformed post", "test", actual);
}