This just happened to me too, rolling back removes all Vienna Ensemble Pro VST3 plugins for me and does not install rolled back versions, I now only show Pro Surround and am unable to load templates with Ensemble Pro because it doesn't exist

Paul, thanks for the tip on getting the sample info from Activity Monitor. I will reinstall VEP7 7.2.1481 and generate that when Logic hangs and send it to VSL support.

Update: VSL Support have been looking into this but have been unable to produce the issue on there side. Meanwhile I have tried various versions of Logic on two different devices and I am getting the problem with all versions after 1406. And it turns out the issue isn't so much with the audio tracks etc. The issue is being caused at the very moment when the VEP plugin in Logic Pro X tries to connect to any instance in VEP on the server. As a test, in an empty Logic project when I create just one track with the VEP plugin, when I click CONNECT in the plugin Logic hangs.

VSL Support have advised that I stay on 1406 for now as apparently developers are currently looking into a general connection problem which was apparently introduced with VEP builds after 1406, and it seems that is causing my issue.  They have advised hopefully the update that fixes it should be released soon.

Sorry I didn't see your post sooner. I had the same problem in November with VEP 7.1.1427.

Like you, I am running OS 10.14.6 and Logic 10.5.1. One difference is that I am running Logic and VEP on the same machine, a Mac Pro 6,1. I just sent details to support as a follow up to my original report, which was Case 482711. 

Thankfully VEP 7.1.1406 still works for me. Glad to help test this for VSL when they have a fix. 

 Carlos

Glad I saw this post before I wrote mine out. Just bought a second license and iLok so I could upgrade VEP on my Mac and server computer, and have run into the same issue with Logic hanging. I just uninstalled on both computers and reverted back to the eLicenser version of 7.0.1120 to get my sessions to work (can't spend too much time messing around on anything I don't know won't run properly at the moment). Running OS 10.15.7 on a 2010 Mac Pro and Logic 10.5.1 and Windows 10 on the PC.

Hi, 

Network troubles are all fixed with the latest 7.2.1516, please give it a try. 

Best, 
Paul

Hey Paul,

Still hanging when I open a session. I've emailed you the activity monitor sample. Let me know if you need any more info.

Thanks!

Hi Paul

Thanks for letting us know about the 7.2.1.1516 update. I am about to release an album so don't want to update anything on my computers in case things stop working and my album gets delayed. Judging by the post from KeplersConundrum it seems the issue still occurs, though I will give 7.2.1.1516 a try in mid April after my release and give an update here.

Regards
Sal

Hi Paul

Sorry for late update but was busy with album release. I just updated to 7.2.1.516 and unfortunately the problem is still there. Logic just freezes when you try to connect to a VEP instance. I tried with existing Logic projects and also with totally new empty project with one VEP7 plugin on a single track and the both cause the problem as soon as I click the CONNECT button in the VEP7 AU plugin. When I roll back to 7.1.1.406 the problem goes away.

Best
Sal

This is exactly how I experienced it on my MacPro 6.1 , Mojave 10.14, Logic 10.5.1 and Vepro 1516. After updating to Monterey MacOS 12 and Logic 10.7.6 everything is now fine.

Thanks Klavaus - glad its working for someone. Unfortunately upgrading to macOS 12 Monterey is not an option for me because my iMac 2015 can only go upto macOS 11 Big Sur, and I can't even go to that as some of my plugins will stop working.