I have one single vault synchronised to several versions of 1P. When I used the Win10 Alpha version for the first time, I had to modify the password for the new software to be able to open it.
What surprises me is that I worked last week-end on my "old" MacPro with 1P (version 4 I guess) and I had to enter my old password to unlock it (but pointing to the same vault on Dropbox): is this normal? I thought that it was changed "everywhere"!
1Password Version: Beta
Extension Version: Not Provided
OS Version: Win 10 Pro
Sync Type: Dropbox