After updating to Logic Pro X v10.7.5

Hello koh112, 

Welcome to the Apple Support Communities. 

The following Apple Support article explains the suggested troubleshooting steps to try if you are noticing that a Logic Pro plug-in isn’t working properly: Bypass, remove, or rescan Audio Units plug-ins in Logic Pro or MainStage - Apple Support

According to the article above, you can attempt to bypass the plug-in, remove or reinstall the plug-in, or find a different plug-in to use instead. 

For more help, you can also contact Apple Support directly. 

We hope that this information helps you. 

Cheers! 

I'm having the same issue. Most Synths in Roland Cloud are failing validation. I've been trying to get System-8 to work as I have an ongoing project with that one. It seems my validation fails at the following:

VERIFYING OPTIONAL PROPERTIES:

VERIFYING PROPERTY: Bypass Effect

ERROR: Property is not writable as expected

FAIL

Is your updated version running in Rosetta mode if it needs to for the plug-ins?

Seen a couple of users where the older version was and the update turned it off.

Worth a check.