Rotated monitor wrong-side up

[John Franklin]

On multiple monitor setup with one rotated, the webapp-container flips the page upside-down. Only the page rotates upside-down, the window border and buttons (minimize, maximize, close) stay right-side up.

For reference:

xrandr --output HDMI3 --off \
 --output HDMI2 --mode 1024x768 --pos 3000x1152 --rotate normal \
 --output HDMI1 --primary --mode 1920x1080 --pos 1080x840 --rotate normal \
 --output VIRTUAL1 --off \
 --output DP1 --mode 1920x1080 --pos 0x0 --rotate right

webapp-container --app-id=foobar 'http://xxxxx/zabbix/screens.php?elementid=16&fullscreen=0'
webapp-container --app-id=foobar 'http://google.com'

The DP1 monitor is the one which displays upside-down, the other two are right-side up. No other programs do this.

If it matters:
Ubuntu-Gnome 16.04 x64
Core i7-6700K
Gigabyte Z170X-UD5-CF
G.Skill DDR4-2133 PC4-17000 16GBx2

And, console output:
Invalid webapp webapp definition: homepage not found or fails predicate isString
Could not open manifest file: "/usr/share/unity-webapps/userscripts/unity-webapps-amazon/manifest.json"
qml: Loading webview on /home/john/.local/share/foobar
Invalid webapp webapp definition: homepage not found or fails predicate isString
Could not open manifest file: "/usr/share/unity-webapps/userscripts/unity-webapps-amazon/manifest.json"
QQmlExpression: Expression file:///usr/share/webbrowser-app/webcontainer/WebApp.qml:273:25 depends on non-NOTIFYable properties:
    unity::action::qml::ActionManager::globalContext
[0326/154813.408663:ERROR:child_thread_impl.cc(762)] Request for unknown Channel-associated interface: ui::mojom::GpuMain
qml: Loaded 8 UA override(s) from file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Web/ua-overrides-mobile.js
qml: Start browsing
file:///usr/share/webbrowser-app/webcontainer/ContentPickerDialog.qml:22:1: module "Ubuntu.Content" is not installed
file:///usr/share/webbrowser-app/webcontainer/ContentDownloadDialog.qml:22:1: module "Ubuntu.Content" is not installed
file:///usr/share/webbrowser-app/ContentHandler.qml:20:1: module "Ubuntu.Content" is not installed
file:///usr/share/webbrowser-app/Downloader.qml:23:1: module "Ubuntu.Content" is not installed
file:///usr/share/webbrowser-app/Downloader.qml:22:1: module "Ubuntu.DownloadManager" is not installed
file:///usr/share/webbrowser-app/Downloader.qml:23:1: module "Ubuntu.Content" is not installed
file:///usr/share/webbrowser-app/Downloader.qml:22:1: module "Ubuntu.DownloadManager" is not installed
[0326/154813.479129:ERROR:layer_tree_host_impl.cc(2190)] Forcing zero-copy tile initialization as worker context is missing
qml: Loaded 8 UA override(s) from file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Web/ua-overrides-desktop.js

[John Franklin (hondaman-nc)]

This also happens for:
unity-webapps-runner --amazon --app-id=ubuntu-amazon-default