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This is a known bug, related to some recent change in the treatment of derivatives of symbolic functions, cf. this discussion. In your case, the bug shows up because of both G[1,1]=diff(f(R),R) and the square root in S[1,1]=R^(0.5).

A fix is under preparation; hopefully it will be included in Sage 7.6.

This is a known bug, related to some recent change in the treatment of derivatives of symbolic functions, cf. this discussion. In your case, the bug shows up because of both G[1,1]=diff(f(R),R) and the square root in S[1,1]=R^(0.5).

A fix is under preparation; hopefully it will be included in Sage 7.6.

EDIT: the fix is ready, cf. the comment below