[OS X Emacs] Files opening in windows rather than tabs

[Tyler Curtis]

I'm trying to figure out some odd behavior in Aquamacs regarding where
new files are opened. Aquamacs crashed while running in full screen
mode on a 15" MBP running Lion. Since the crash files opened from
Terminal now appear in new windows rather than in new tabs in the same
window (not in full screen mode, all examples used R files and ESS
mode)

* Open two files from Terminal (Aquamacs closed): new window with two tabs
* Open two files from Terminal (Aquamacs closed), then another file
from Terminal: new window with two tabs followed by a second new
window
* Open a file from Aquamacs with only scratch buffer open: new window
* Open a file from Aquamacs with another active buffer: new tab in same window
* Drag a file onto Aquamacs: new tab in same window

I've checked and reset both the Show Buffers in One Frame and Show
Tabs options, deleted Preferences.el, tried running without
customizations, reinstalled Aquamacs 2.4, built 2.5 from the github
repo, and tried the 3.x nightly build. All have the same behavior. I
haven't (knowingly) changed anything else; this setup had been stable
since moving to 2.4 this Spring after upgrading to Lion.

Any ideas, or other tests I can try to help reproduce the error?

Thanks,
tyler

-----
Tyler Curtis
Opower
tyler at opower.com