[AndrewJS]

Just to clarify:

1) The old 2009 festo valve works when manually testing it. It was wired into the 12v power supply (not 24). When testing with the sample program "simple solenoid example," an orange light lit up on it, but it did not actuate. We double checked the wiring and the plumbing to no avail.
2)The 2010 valve was plugged into the 24v power supply. I was absent for most of it's testing and can't say much more.
3) Yes both had 60psi of pressure (sometimes a bit less) going to them via the regulator.

We meet tomorrow at 9am, so we'll test all other possible suggestions/options then. My guess is that it's just defective, but we'll double check as always.