can i assume the firmware in your BXEBC100 is up to date (v4.2.133) it needs to be at least v4.2.120 or later as we fixed an error reporting issue in that version.
i haven't been able to dup this problem using your arrangement of modules, so if you're game i'd like to try single stepping through the setup to see where the problem shows.
the EBC100 can only have one master, so you'll need to temporarily disconnect your CPU as the master by powering the CPU down or unhooking the ethernet cable from the master.
then fire up the Do-more Simulator and configure it to be the Ethernet I/O master, add that ebc100 as the slave - but don't configure the UT yet - simply add the slave (remember to increase the Timeout in the Slave Config to 150ms), save the config, download it to the Sim, and go to RUN to see if that works with no errors or warnings.
if that works cleanly, configure the UT module as it should be, 6 channels enabled and proper probe type. then save the config, download, and see if that still works cleanly.
if we're still good, then induce a problem - remove one of the wires from one channel - that should cause a warning. Open the I/O System view to make sure it's the right channel showing the warning. then replace the wire and see if that warning goes away.
If the I/O System View is still open, the warning should clear itself.
If the I/O system View is NOT open, the warning will remain until you manually clear it.