As per the subject, all automation with the following set up fails. It can be recorded in real time accurately, but if you try to edit automation, it locks to a value of 0 or 127.
Cubase Studio 5.1 64 bit
Windows 7 64 bit Professional
VC included with TIOS 220.127.116.11 Beta VST3 (64bit)
TIOS 18.104.22.168 Beta