That's the way it used to be. Following the patch, saved information
has been moved into one lua file per addon, ithin the WTF structure -
see the patch notes. The real "gotcha" is that, for the info to be
migrated, the addon apparently had to be active when WoW was first
restarted after the patch. Given that the first thing you'd then have
gotten would have been a message telling you that all your addons were
out of date, and that you *really* ought to disable them, I suspect a
fair number of people will have lost saved info by consequence..
As far as installing new mod versions after a patch goes, personally,
I usually rename the Addons folder, create a new one and populate it
from scratch - I feel that that way I'm much less likely to have
something archaic lying around in some obscure corner, screwing
everything else up. For data backup for Gatherer I use Gatherbook to
copy my info before each scheduled maintenance, as a matter of
principle.
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