If the moving gate has moved into a street by the time my investigator returns to Arkham can I still seal it - or just close it? IIRC the rules talk about 'sealing gates' - but I just wondered if this really means 'sealing locations' and then I wondered whether a 'street' counts as a 'location' (I know it DOESN'T when it comes to Mythos Card instructions!).

While I am in question mode (and this may have been answered elsewhere). What happens when an investigator has an encounter at a location with an elder sign and the encounter says 'A gate and a monster appear'? I assume NOTHING as gates cannot open on seals (except for gate-bursts) but conceivably a monster could still appear.

E.

Gates may only be sealed when they are on unstable locations. Stable locations and streets do not count. So once the gate moves, it can no longer be sealed. FFG has slipped up when using the term "location," so be cautious and make sure to read an effect's context to make sure it truly means "location" and not "area."

As for your second question:

Firstly, "A gate and monster appear" is the same thing as a gate opening during the Mythos phase, so the "monster" part is just being redundant. An elder sign will block the gate, and therefore the monster.

Secondly, encounters such as "A monster appears!" are canceled too. It's easy to overlook, but the rules do say that elder sign tokens prevent monsters from appearing during encounters.

Elendil23 said:

which makes Atlach pretty lovable even in these cases!