It turns out that Tutorial=0 means "auto" and -1 means "off". With auto tutorials, the hphpd.hdf file got updated and test behavior got flaky. Even worse, the non ASCII characters in the tutorial output broke the test runner in a way that made it look like tests passed when you put up a differential, only to fail in contbuild.
These tests failed on the continuous build server, so we disabled them. Since then many other tests have failed and there is no good reason to suspect these tests of being especially flaky, so we may as well re-enable these tests.
The debugger client now accepts feedback from the the debugger server about whether a breakpoint can be hit, absent further loads of files, classes or functions.
Herman Venter