Control not returning to calling/parent script

[mbrock]

We are having issues with 8.5 where it seems that once a called script is done running, the control is not returned back to the parent/calling script. Since we have the option checked to "Wait for Completion", our entire build gets stuck.

We run the GUI, and the parent script indicates that the child is still "Building...", but there is no window for the child. The log has the output from the child script, and shows "Build successfully completed". Also, looking at VisBuildPro.exe in Resource Monitor, it's not red indicating that it's hung, but looking at the Wait Chain there is a child thread of the same PID that seems to be causing the hang up.

I have the info. to submit a bug for this, but wanted to start here first to see if there's a known solution.