tabs not restored with ssop="buffers,sesdir,folds,tabpages"

Version 7.3 with gVim (Windows) and MacVim, with set
sessionoptions="buffers,sesdir,folds,tabpages" the tabs are not
restored.

The Windows version is a default install and the Mac one is started
with -u NONE -U NONE, then upon opening I set ssop. I open
file[1-5].txt from a temp folder and create tabs as following: Tab 1
has vsplit(file1, file2), Tab 2 has split file3 with vsplit(file4,
file5). After the setup I call :mksession.
After restarting Vim with the same options, I set ssop, then
call :source Session.vim and observe that only the last active tab is
restored, but all the files are loaded in buffers.

The two Session.vim files, one for Windows one for Mac, are here:
https://gist.github.com/1437522/. I compared them and the only
difference is pretty much the paths.

I expected that "tabpages" would be enough to restore the tabs: "all
tab pages; without this only the current tab page is restored, so that
you can make a session for each tab page separately". With the default
options, the tabs are loaded properly (but I don't want to persist the
mappings, etc).

What am I doing wrong?

Thanks.

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