Hello Stringtheory,
Ya, we're aware of the "Jerry" line in the code. It was left in there accidentally by one of the plug-in programmers but I am confident that it isn't the root of the problem you are having. It only shows up in the error message.
Here are a few things to check.
1. Verify that the TranzPort Manager is set to "Native" mode before launching DP.
2. If you can use TranzPort (set to iTunes mode in the TranzPort Manager) to remotely control iTunes than you know the basic TranzPort drivers, and the unit itself are working just fine. If this is the case than we can focus solely on the DP configuration.
3. Verify that your do have v1.0.5 of the DP plug-in and it is located in the correct folder (HD/Library/Audio/Plug-Ins/MOTU Control Surface). You should see a few other controller plug-ins in there as well that get installed with DP. The TranzPortUB.bundle Plug-In should be 88kb in size and have an icon that looks like either a 2-pinned audio jumper, or a cube.
4. If you right-click (or CTRL-Click) on the plug-in itself you should see a menu appear. Select "Show Package Contents", then open "Contents". There you should see 3 items; a file called info.plist, a folder called MacOS, and another file called Pkginfo. Let us know if you don't see all 3 of these.
If you move the TranzPortUB.bundle back to the desktop from its current location are you then able to launch DP successfully?
Check these things out and let us know what you find. I'm sure we can get you sorted out.
CS