We use "echo N | gpupdate /force"
Tested with 7.12, without any fails.
We have the same issue. Upgraded today and now our script doesn't work.
Will try the suggestion noted here
edit: try to change our script to but still no luck
#echo %DATE% %TIME% > "C:\Program Files\VieCuri\scripts\postsync.txt"
echo N | gpupdate /force
shutdown -r -f -t 00
Provisioning error occurred for Machine CSICTEST1-0003: Instant Clone agent initialization failed
Instant Clone agent initialization state error (19): Failed to execute postsync script
Last comment in this thread C:\Windows\Temp\vmware-viewcomposer-ga-new.log file is not present on instant clone VM with Horizon View 7.11 stated that it is a known issue.
Haven't tried this workarround yet myself.