Upgrade to 170x TS progress bar not showing

[simulacra75]

Hi everyone

Have a TS that upgrades Win10 clients to Win10 170x. There are a number of steps in the TS, showing splash screens, removing some software, etc ,etc. I based it upon Niall's TS here at windows-noob. Have a slight problem though, namely Task Sequence progress bar not showing. Basically there's a pre-upgrade step that removes some software and then reboots the machine. After reboot the TS progress bar does not come back, even though i can see from SMSTS.log that the TS is indeed running. Obviously this might cause confusion to end users, wondering if their "upgrade" is finished (when it's not from the log files). 

I should point out that the progress bar doesn't appear if nobody logs on, or if the last person (before the restart) logs on. Anyone have any ideas as to how i can get the Progress Bar to appear?

 

Thanks