Fresh install of 3.2.1
Windows will not open the standalone. The service starts, but the app never appears/loads.
Both Fender Studio Pro and Cakewalk Sonar hang when scanning the vst3.
People have been reporting this stuff for months and months. It feels frustrating to have paid for this plugin, but to have to keep it uninstalled to be able to make music. 
I get the same issue. The most recent version 3.2.1 standalone does not start. Service is started, but never opens. I conduct restart of machine and same issue on clean boot. The vst3 does not open in Cakewalk Sonar. So I downloaded version 3.01, I think, and was able to get car to run inside Sonar. Still not able to open older version of standalone app
@willl This is not related to an earlier Studio One specific issue we fixed in 3.2.1.
This issue is due to a Windows MIDI Services Update that is conflicting with our new MIDI Routing feature introduced in 3.2.1 – We are testing a beta now we believe has fixed it. I have PM’d you and @ZERBD with a beta. Can you install this build please and post back here if this fixes the issue so we can move it to a release candidate.
Ahhhh… I do feel a bit relieved it’s not the same issue.
The build is working for me!