Originally Posted by
aktchi
Thanks. I have been able to narrow the problem I am experiencing: For some reason EF doesn't like the option "Show Fares for All Travel Dates" for NRT (it works fine for all other destinations I tried).
ETA. The situation seems to be improving. Thanks EF! I should have posted here earlier.

There is an issue with our GDS returning an error for a Show All Fares search for certain international city pairs, but it seems to be random. However we already alerted them and they assured us that they are fixing it soon, if not already. Thanks for your patience.