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Hello Eric,

Thank you for your answer It now works fine!

I noticed that the SageManifold source code is available in the delivery (I thought initialy this was reserved to the Sage source code version). So I dived (painfully as not a Python programmer) into *.py files and finally into the diff_map.py, and isolated the _pullback_chart method as being either the bug place, or a place where I can insert a patch. Apparently in the routine the line containing "return resu" is indented 1 step too much, so the loop "for frame2 in tensor._components:" is executed only once. If you are lucky because the top charts are in the favourable order this is the good one; if not the routine returns an empty dictionnary . So I reduced the indent and got a satisfactory result at the end of _pullback_chart routine.

I cannot say it is a full fix, it may be a regression is some other ways. Just hoping it may help.

Kind regards, Laurent