While trying to get access, after entering login & pass, an error window "An attempt was made to access a record in the database that is locked by another user ..."
I'm under W7 x64, and the same vault opens perfectly on other platform such as XP x32 (the deals with other platforms I didn't know)
If you can log in somewhere else, under another name make sure that the Lock setting is correct for your needs, i know its obvious but the amount of times ive missed the easy stuff!
shot attached is of pdm admin (if you can get in)