This is a known issue and is scheduled to be fixed in the next release of the core.
To work around the issue, please copy the attached files pci_exp_ursapp_tx.v and sample_tests.vh into 'dsport' and 'tests' directories respectively in the generated project directory.
Note: "Version Found" refers to the version where the problem was first discovered.
The problem might also exist in earlier versions, but no specific testing has been performed to verify earlier versions.
04/16/2014 - Initial Release