2017r1 plugins not loading

I have downloaded the 2017r1 on my iMac and copied all of the usual plugins I use to the new plugin folder but when I start up Xojo none of the plugins are loading, and when I look in the About / plugins list it is empty. Anyone have any ideas why this might be?

It’s a thing called Translocation and we’re still all trying to figure out how, why, and when >_>
Solution is here: https://forum.xojo.com/conversation/post/323028

Remove the quarantine flag via xattr command line tool in Terminal.
(and search forum as a lot of people had it before)

Thank you both, that sorted the problem.