The vault wont syncronize to another computer

Suddenly the vault does not sync down to another pc. This has worked great in the past. After recently having changed some passwords, and went to another computer, I discovered quickly that I got up the old passwords. I then went into the vault through the browser and there I found the new passwords. I've been through all possible settings, but find no way to change anything that gets this working again. How do I fix this? :smileyfrustrated: