Congratulations, Sallye, on your 20 FC. We picked up ours last Oct and have now used it for about eight weekend trips and one week-long trip. We've loved every minute of it. Hope you enjoy yours as much as we have enjoyed ours!
Now, for that pesky window. It seems to have been designed that way. We think of it as a design flaw. The bathroom wall next to the window seems too close to allow the window to have the arms to open. We brought it up with our dealer/mechanic (where we store ours). He talked to AS about it and AS told him that they have no plans to make it a stay-open window. It's the same on the 2015s. According to AS, the window is too small and is not positioned to be an egress window, so they are not putting in arms. Still doesn't make sense to me. You would think they could create something that would hold it open.
There area few threads in here where people have come up with creative ways to hold it open. Check out the On Cloud 9
for one idea. We still haven't created anything that will hold it open, but use one of these ideas.
Let us know what you find out from AS.