pnoise jitter Jee plot button disappeared

Hi everyone,

With ADEXL, in a shooting pss + pnoise jitter analysis, I try to plot the jitter (edge) Jee vs. df, but the "plot" button has disappeared! I can only get the integrated noise value; I was still able to do that a couple of weeks ago...
What could have happened ? How could I plot it ??

I use the IC6.1.8-64b.500.5 version of Virtuoso.

Thanks in advance for your help.