I've got a few machines running Opera 8 on which I cannot set the master password. When I check the "use master password for e-mail and Wand" under Tools ¦ Preferences ¦ Advanced ¦ Security the settings simply aren't retained after I check the box and click OK. When I open up my preferences again the box is unchecked.
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.
I believe some files may have changed between versions. When changing between major versions of a browser, it's always wise to install into a new folder. Then import any old settings manually. This could be the source of your problem, as old and new settings conflict.
Yes, I agree. However, I had read that this really wasn't a point release and people in the Opera forums seemed to be installing over the old version without issue. I was also just following the advice given by Opera itself:
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.