
This is a familiar sight as I've had this box pop up many times before in previous versions of Live (on this and different computers) but not recently and not with these betas. Been through support and an answer/solution was never really found.
The plug-ins in question are always active and work fine in the session after hitting 'okay'.
Different plugins show up as 'not found' when loading up different sets. Sometimes it's a few, sometimes it's everything contained in the session. They all work fine, it's just an annoyance.
(I'm wondering if this is the same thing that some other people have been reporting with regards to plugins not showing up?)