Index.html is empty when using testng html report in 1.4

I was just upgrading my build to 1.4 to try out the multiproject testReport task. This appears to work fine but the per project test reports are not. I find that

  • the index.html is empty, i.e. shows 0 tests/0 failures * the package and test html files have correct data

This seems slightly confusing given that all 3 reports work off the same source data (the ‘AllTestResults’ model) so if one is right then I would have thought the others would be right too.

Any ideas what is going on?