Hello Richardeden and welcome to the forum.
I have read of several problems in Logic 10.5 with products from several developers. Can you temporarily go back to v10.4?
As this is primarily a user to user forum, someone-else may chime in [#]. Meanwhile, the best thing to do is raise a
Support Ticket, here for some one to one investigation and help (US (East Coast) Business hours, generally). Response time is usually within 2 working days, but in the current circumstances please allow some more time.
[#] But please remember that the same symptoms do not necessarily mean the same problem.