After much longer than really should be required to fix something that shouldn't be shipped broken, I tracked the issue with one of my VSTs by finding its log:

Vita Version 2.6.0.34 Windows 64 bit
01:44:37:216 (error)        file_access::get_file_for_url() failed!
requested url: com.files.base/config/automation_1_1_0.lua
GetFileAttributes failed! the file/folder doesn't exist!
full path: "c:\Program Files (x86)\Common Files\MAGIX Services\MxSynth\Harmonica\config\automation_1_1_0.lua"
full path: "c:\Program Files (x86)\Common Files\MAGIX Services\MxSynth\Harmonica\config\automation_1_1_0.lua"
01:50:37:674 (error)        file_access::get_file_for_url() failed!
requested url: com.files.base/config/automation_1_1_0.lua
GetFileAttributes failed! the file/folder doesn't exist!
full path: "c:\Program Files (x86)\Common Files\MAGIX Services\MxSynth\Harmonica\config\automation_1_1_0.lua"
full path: "c:\Program Files (x86)\Common Files\MAGIX Services\MxSynth\Harmonica\config\automation_1_1_0.lua"
01:53:03:904 (error)        file_access::get_file_for_url() failed!
requested url: com.files.base/config/automation_1_1_0.lua
GetFileAttributes failed! the file/folder doesn't exist!
full path: "c:\Program Files (x86)\Common Files\MAGIX Services\MxSynth\Harmonica\config\automation_1_1_0.lua"
full path: "c:\Program Files (x86)\Common Files\MAGIX Services\MxSynth\Harmonica\config\automation_1_1_0.lua"
01:53:06:911 (error)        file_access::get_file_for_url() failed!
requested url: com.files.base/config/automation_1_1_0.lua
GetFileAttributes failed! the file/folder doesn't exist!
full path: "c:\Program Files (x86)\Common Files\MAGIX Services\MxSynth\Harmonica\config\automation_1_1_0.lua"
full path: "c:\Program Files (x86)\Common Files\MAGIX Services\MxSynth\Harmonica\config\automation_1_1_0.lua"
01:53:10:901 (error)        file_access::get_file_for_url() failed!
requested url: com.files.base/config/automation_1_1_0.lua
GetFileAttributes failed! the file/folder doesn't exist!
full path: "c:\Program Files (x86)\Common Files\MAGIX Services\MxSynth\Harmonica\config\automation_1_1_0.lua"
full path: "c:\Program Files (x86)\Common Files\MAGIX Services\MxSynth\Harmonica\config\automation_1_1_0.lua"
 

The VST in question is the Magix Harmonica VST from their store. Reseting all VST pluggins temporarily solved it, but not for long. Nor did creating my own "automation_1_1_0.lua" with "return true" for the code.

Any help would be appreciated because I really like the way the harmonica VST sounds and would like it to work.