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I've been using 1Password (Mac, iOS, Safari extension) for years. All of a sudden, everytime I open Safari there's a box warning that Safari couldn't load 1Password extension; as far as I know, it's still there. Went to 1Password Mac version, chose Install Safari extension, downloaded it, but I get a message "Safari can’t install this extension". I'm using Safari 8.0.4, 1Password 5.1 (AgileBits store), and OS x Yosemite 10.10.2. What's going on?
PS 1Password still seems to work in Safari. Why all the error messages?