The non-trial, commercial version does not have this problem. However, after creating a DataAdapter (which previews the data just fine) and adding a DataGridView, it now complains in the debugger that I don't have a license.
I'll try the same thing to a SQL Server and see what happens, but it certainly won't be a licensing error. This is the sort of thing that is supposed to go away once you pay for the software

BTW, I uninstalled the trial version and rebooted before installing the commercial version.
Any ideas? I'm just trying the most basic of tests.