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I'm having this problem on Windows XP and 2000 machines. All of these problem machines were upgraded from Opera 7.54 and did not have a master password previously set.
Someone suggested that I try Tools ¦ Delete private data..., but that did nothing (other than deleting my private data.)
I also tried deleting opcacrt6.dat and opcert6.dat. This deleted my passwords and master password, but I still can't get the master password settings protect the e-mail and passwords on these machines.
Suggestions?
Migrating from Opera 7.5 to 8.0 [opera.com]
...
To upgrade from Opera 7.5 to Opera 8 for Windows, simply install the latest version in the same folder where the previous version is installed. Mac and Unix users can just install the newest package normally.