Re-Compilation Required

If you're using the compiler you need to recompile via System->Tools->Compilation (it will say here if it's compiled, if you're using 1.4 and it's compiled but disabled you may need to re-compile anyway).
 
If you do not you will see an error similar to 'Call to a member function toOptionArray() on a non-object...' when accessing shipping methods. You may also see Fatal Errors for missing files
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