A few questions/comments to help figure out which direction you may need to go...
Does this happen on every split node? Or just this one? If it doesn't happen on every split node, what happens if you delete this split and add a new one?
Does the same problem occur if you split by percentage? by data item? Check the "make output cells available for linking" box?
The split node runs as a stored process, so if you have the correct debug logging turned on for your version of MA (which looks like an older 5.X release to me?) you should be able to see the output of that code in your MA Core log. That might give you some information about why it's failing to produce the output you're expecting. Are there any errors in the log?
What version of MA are you using? And what operating system?