I had the same problem. I solved it by clicking the PERF button to load the performance screen, and then pressed the F-PLN button for the flight plan screen, then pressed the INIT button to get back to the initial screen. The flight plan request button became active and I was then able to load my flight plan into the FMS.
Also, in my flight plan, I am departing from runway 30 at YWLM using MONDO1 SID. Before updating the Navigraph data in the EFB, MONDO1 did not appear in the list of SIDS. Now it does. So I am now a "happy chappie"!