[Ifeffit] Inability to plot in any space other than E

Hello, I have some EXAFS data at the S K-edge which all merges very nicely but I can't plot it under anything other than E. The other options are faded out along with all Fourier transform options, Rbkg etc. Is this a comment on the quality of the data (its not great)?! Or is it something else, the other plotting options work fine on other data (at other edges) I have. Any help / advice great fully received. Andy