Is it constantly out of sync, or does it start in time then drift?

Constantly.

Like it moves after its recorded.

Could be when you're playing, the tracks played back are delayed by X ms on the way out, and it sounds in sync with those, but since they're off, it's really out of sync. Bad latency compensation, maybe.
Dunno Nuendo 1.5 though.

What's the "Timing Source" when you record, and when you play back?

Kapt.Krunch

Has to do with MIDI port filter and where internal clock comes from- I had same issue - Search Stienberg site.
You simple move the folder to another folder. I'll see if I can find the specifics...

Is there a way to do this easily.

I'm pretty familiar with the folders in Nuendo but it sounds like its not just a setting.

Anything you can send me would be great.

It's not that complicated. It' litterally moving a file from inside the folder to the main steinberg folder.

Navigate to C://program files/Steinberg/Cubendo **/Midiportenabler

In that folder, there is a file called "ignoreportfilter". Cut that file out and paste it up one level in the main Cubendo folder.

Now open Cubendo. Navigate to devices/device setup/Direct music. Here you will see all your MIDI ports, and some of them will be replicated with the word [Emulated] after it. Set all emulated ports to visible, and set the non-emulated versions to not visible. Also, navigate down one level to Windows MIDI, and set all non-emulated ports to not visible.

As of now, use the emulated versions of any ports pertaining to your m-audio device.

Hope this helps.

I dont have this folder or this file...remember I'm on Nuendo 1.5