Package Conflict

[Nathan Moynihan]

I am using xAct to calculate some scattering amplitudes and I have run into a strange bug due to two packages conflicting, namely xAct and Spinors@Mathematica (S@M). When I try and use a replacement rule to expand some terms, I get errors of the type: “IndexForm::nouse: Attempting to apply IndexForm on 0.” I have found that having $PrePrint = ScreenDollarIndices; causes this problem, but it also seems that simply using the function ScreenDollarIndices[] will also cause it. I have also tried ClearAll[$PrePrint] to no avail. Short of unloading S@M (which I can't really do), I'm not sure how to fix this one. Anyone have any ideas? Minimal example attached. Thank you.

[Thomas Bäckdahl]

Hi!
It seems like your minimal example was a bit to minimal, because I can not see the error message in your file.
The only error message I get is a missing sm\SamPalette.nb file.

Regards

Thomas

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