I think the relevent section is
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I turned off every addon I had one by one with no result on the default cast bar
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Asuming Spartan was the only addon excluded from this process, it would seem that the problem is indeed with Spartan, or possibly an addon library that starts with ! and turns off the cast bar by default and that's just a shot in the dark.
Another possibility is a difference between MoP beta and 5.0.x (if the Spartan author is releasing code based purely on beta). I'm experiencing these differences with DUF (yeah, yeah I know, lots of pre-historic code
), although on a cast bar level it has only been to do with fishing (DUF doesn't use the default cast bar).