Can not add new Control to app in AppStudio

When I open this app in appStudio, I click on a Common Label control and drag it to the Form. Nothing seems to happen… the Lb control does not appear on the Form nor does it come up in the Project Explorer.
Using Project Explorer, if I open another Form and attempt to add a control, I get the same response.
When I go back to the first Form I attempted to update… the Lb appears on the Form display but it is NOT in the Project Explorer. Clicking on the Lb on the Form display does NOT select it.
The Form is NOT locked.
I restarted the computer (W/10 PC) and got same results.
I reinstalled AppStudio 6.3.1.0 and got same results.
I can change code.
I can select ALL control on a form, but cannot select the control I’ve attempted to add, but CAN select other controls n the same form.
Following is the app:
SkillMeNowMeetings.nsx (684.8 KB)

And here’s all the info from the Google Console (captured while AppStudio was open)
The SSL certificate used to load resources from will be distrusted in M. Once distrusted, users will be prevented from loading these resources. See for more information.
ads-no-meta-refresh.932e598aa105b2fa5388.js:1 positions: Array(12)
container.html:9 The Content Security Policy ‘child-src ‘self’ ‘unsafe-inline’ cm.g.doubleclick.net googleads.g.doubleclick.net www.google.com accounts.google.com pagead2.googlesyndication.com/pagead/s/cookie_push.html gmsg://mobileads.google.com https://tpc.googlesyndication.com/sadbundle/$csp%3Der3%26dns%3Doff$/2337549954458798911/index.html;frame-src ‘self’ ‘unsafe-inline’ cm.g.doubleclick.net googleads.g.doubleclick.net www.google.com accounts.google.com pagead2.googlesyndication.com/pagead/s/cookie_push.html gmsg://mobileads.google.com https://tpc.googlesyndication.com/sadbundle/$csp%3Der3%26dns%3Doff$/2337549954458798911/index.html’ was delivered via a element outside the document’s , which is disallowed. The policy has been ignored.
(anonymous) @ container.html:9
city-today-module.2a85dd49ee53accd790a.js:1 It’s calling init
container.html:9 The Content Security Policy ‘child-src ‘self’ ‘unsafe-inline’ cm.g.doubleclick.net googleads.g.doubleclick.net www.google.com accounts.google.com pagead2.googlesyndication.com/pagead/s/cookie_push.html gmsg://mobileads.google.com https://tpc.googlesyndication.com/sadbundle/$csp%3Der3%26dns%3Doff$/2337549954458798911/index.html;frame-src ‘self’ ‘unsafe-inline’ cm.g.doubleclick.net googleads.g.doubleclick.net www.google.com accounts.google.com pagead2.googlesyndication.com/pagead/s/cookie_push.html gmsg://mobileads.google.com https://tpc.googlesyndication.com/sadbundle/$csp%3Der3%26dns%3Doff$/2337549954458798911/index.html’ was delivered via a element outside the document’s , which is disallowed. The policy has been ignored.
(anonymous) @ container.html:9
07104:1 Additional resources on this page were loaded with SSL certificates that will be distrusted in the future. Once distrusted, users will be prevented from loading these resources. See Google Online Security Blog: Distrust of the Symantec PKI: Immediate action needed by site operators for more information.
js:1 Building
sca.17.4.47.js:20 [Deprecation] ‘webkitURL’ is deprecated. Please use ‘URL’ instead.
testFunctions @ sca.17.4.47.js:20
run @ sca.17.4.47.js:19
collectData @ sca.17.4.47.js:21
w @ sca.17.4.47.js:19
setTimeout (async)
B @ sca.17.4.47.js:19
aloneCheck @ sca.17.4.47.js:21
f @ sca.17.4.47.js:19
checkIfTransportReady @ sca.17.4.47.js:19
init @ sca.17.4.47.js:21
r @ sca.17.4.47.js:19
(anonymous) @ sca.17.4.47.js:21
sca.17.4.47.js:20 a: 0ms
sca.17.4.47.js:20 a: 0ms
6155350943:1 GET https://simage2.pubmatic.com/AdServer/6155350943 404 (Not Found)
Image (async)
b @ usersyncall?impinit=1:1
pixelLoad @ usersyncall?impinit=1:1
(anonymous) @ usersyncall?impinit=1:1
ads.kiosked.com/match?bidder_id=4&external_user_id=RX-5bbffaed-b5d3-4b97-b756-971adc171b19&rndcb=4160454542:1 GET https://ads.kiosked.com/match?bidder_id=4&external_user_id=RX-5bbffaed-b5d3-4b97-b756-971adc171b19&rndcb=4160454542 net::ERR_CONNECTION_REFUSED
Image (async)
b @ usersyncall?impinit=1:1
pixelLoad @ usersyncall?impinit=1:1
(anonymous) @ usersyncall?impinit=1:1
container.html:1 Mixed Content: The page at ‘https://www.wunderground.com/weather/us/nj/newark/07104’ was loaded over HTTPS, but requested an insecure image ‘http://sync.1rx.io/usersync/go2mobi/4784662001251845810’. This content should also be served over HTTPS.
Enabler.js:123 [ 0.002s] [studio.sdk]
Enabler.js:123 [ 0.000s] [studio.sdk]
Enabler.js:123 [ 1.881s] [studio.sdk] Using default ad parameters in test environment. Simulating local events.
Enabler.js:123 [ 1.769s] [studio.sdk] Using default ad parameters in test environment. Simulating local events.
ads.stickyadstv.com/user-registering?dataProviderId=189&userId=1901082470298449095:1 GET https://ads.stickyadstv.com/user-registering?dataProviderId=189&userId=1901082470298449095 net::ERR_TOO_MANY_REDIRECTS
Image (async)
b @ usersyncall?impinit=1:1
pixelLoad @ usersyncall?impinit=1:1
(anonymous) @ usersyncall?impinit=1:1
sync.pulseradius.com/ Failed to load resource: net::ERR_EMPTY_RESPONSE

It’s not possible to run an AppStudio app without all the files it uses, so I wasn’t able to open this project.

Can you create the absolute smallest project that reproduces this problem? Take out everything that isn’t needed to make it happen. It’s the first thing I would have to do here, but since you know your program inside out, you’ll be able to do in a fraction of the time. What sometimes will also happen in this process is that you might find there is a problem in the code after all.