We've checked it and indeed there's a bug with it. We're gonna
file an issue in our bug tracking system and we'll fixit right
Anyway, you should be able to copy the embed code by double
clicking in the text field containing the code, and copying it with
Control+c. Although you can't see the whole text selected, the
double click will select it all.
If you still can't copy the embed code that way, get back to me
with the map name you want to embed and I'll provide you with the
embed code you need.