On several different installs I'm finding that when I finish editing an entry and hit Submit, the submission sometimes completely fails and I am redirected to the Control Panel home page.
I'd like to stress that in all cases I remain in a logged in state so it seems to be a different issue than the OP was raising in the EllisLab forum thread at How to stop CP timeouts completely – although I note that some of the commenters in that thread are citing the same behaviour as I am describing here.
I have 3 different installs where this is happening, each with a different mix of add-ons from lots and lots to effectively none.
At first I thought it was to do with the security warning interjecting on a 2.6.1 install, but now that is updated and yet it's still happening.
And just now, it's happened to me while working on a local 2.7.2 install in which the only add-on installed is Wygwam. But Wygwam is currently not being used on any fields, so the active number of add-ons on the entry that just failed to submit is zero.
That said, as I'm concluding that I probably don't need Wygwam at all on that install I shall disable it and see if this weirdness happens again.
Anyone else got this kind of thing going on? Because it's not good and it's understandably bugging my clients on the live installs.