Sounds like you may have narrowed or pinned it down, so hopefully they can address it quickly.
Yeah, it seems like Slack gets far more attention than here, but sure that platform allows for more realtime awareness though, via push notifications, etc. However, I am typically accustomed to user Forums being more active and involved. I continue to wish this place would pick up activity and users.
I notice on the main for Pinegrow .com page there is no mention of a User Forum. Even under the “Support” link only Slack is listed (as a super-friendly community). You have to click on the Docs link to then get a link to the Forum. I am sure this absence on the main page plays some role in the general inactivity here at the Forum as well and perhaps the lack of users.
Maybe things will pick up here with Version 3 official release?