Sublime Text 2 packages ignored

Sublime Text 2 packages ignored

So after switching over to Sublime Text last year, it has become my editor
of choice, and I have installed several different packages via the
excellent Package Control and basically customized it all to my liking.
After a couple months of infrequent use, I jumped back into a
code-intensive project and fired up ST2 only to find that none of my
packages are working.
After some digging, it finally occurred to me to open my preferences file,
only to find all of my installed packages in the "ignored_packages" list.
WTF?
Has anyone else experienced this or know what would have caused this? I do
some funny things in my sleep sometimes, but not this!