Has anyone else had trouble getting certain Addins to install or remain
installed?

Flashback has always been rather finicky in this respect. It will be there
for weeks on end, then just disappear and I'll have to double-click the ppa
again to reinstall it. And all is fine.

Right now, however, I just can't get Flashback to reinstall. I've downloaded
a new version, tried adding it from within PPT (Add new..), restarted, but I
just can't get it to install. I don't get any error messages, it's just that
nothing happens...

Any advice?

- N