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This is a general problem with Sage, which isn't specific to SageMathCloud. I'm surprised nobody noticed this before. Anyways, the problem is really that

sage: maxima._read_in_file_command('x')
...
NotImplementedError:

What is happening is that nobody implemented the _read_in_file_command function in Sage for the maxima interface, since I guess nobody hit this or none of us know how to read a file in (for evaluation) in Maxima. If that function were implemented, things would just work.

The reason that things work fine for smaller input is that the maxima interface doesn't use a file for smaller input.

This is an old bug in Sage. It's probably related to this: http://trac.sagemath.org/ticket/1660

I opened http://trac.sagemath.org/ticket/17388 for this bug.