Qt Creator (mac) periodically hangs entire system

on my mac (not others), upon launch of Qt Creator, the entire computer hangs (no response of any clicks in any location) for a period, then computer recovers briefly, only to cycle again. this continues until i quit the app.  does not happen when launching app from command line.

see forum post here, and "interest" list thread with subject "Mac Qt Creator 4.11.2 consistently periodically hangs"

TCC.framework (tccd) seems to be involved, though not proven. forum post has most detail. List thread suggests ensuring Qt Creator has proper permissions in the security pref panel, which it does (does NOT have permission for address book, for example)