Can you check the developer console and report back any errors? That is often a very helpful indication of what might be wrong. I suspect that it is very likely that IE11 would require some polyfills.
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I'm running iPADOS 13.1 and the editor opens fine for me on a new iPad pro (portrait and landscape).
On my iPhone 6 (iOS 12.4.2), if I'm in portrait mode, the editor partially opens
but if I turn it to landscape mode and reload everything shows up and continues to show if I flip to portrait mode.
What device are you using and have you tried in in landscape mode?
Some fixes have already gone in since beta4 for the mobile view. I believe it addresses this all-but-the-header blank view.
Interesting indeed, same behaviour here, iOS13 on iPhone 11. Horizontal + reload works and turning back as well, but loading in portrait not.
Not certain if this is my setup or an issue but I was having a problem on beta3 with selecting nodes in the editor. Looking in devtools i see TypeError: Cannot read property '_focusTabbable' of undefined in vendor.js. So assuming this was a beta3 issue I have updated to beta4 - but I got the same issue.
node -v
v10.15.3
This may be somehow related to something I am working on (a contrib node @BartButenaers & I are working on) though i'm not sure how.
What I experience...
At first, loading NR into browser, all is fine. I can open nodes editor, I can move, deselect, re-select, deploy etc. Then, If I add a node via CTRL+Left Mouse Click, nothing is selectable, I cant open the nodes editor and the above error occurs in Devtools clicking any node or any area of the canvas.
UPDATE...
I have tried to recreate the issue using above steps - but it is not occurring now.
I have changed nothing bar perform a single deploy since I was having this issue.
Latest beta 4 running on a RPi3B+
Node status is lost when changing tabs. A browser reload recovers them. Chrome, Safari on a Mac, the same behavior running Chromium locally on the RPi
This is the "normal" look, all node statuses are shown correctly first time you select a tab
After changing tab and then returning to the previous all node statuses are lost, requires a browser reload to get them back
Good spot, hadn't noticed that. Happening to me too on Win10 with Edge Dev (Chromium based).
Also happens on Win10/Edge.
On IE11, I get this:
Looks like all tabs are rendered on a single "page"
In addition, on Edge (not dev), I have 1 tab that disappears if I change away from it and then back:
No errors shown in the dev console.
Thanks - now fixed.
There are a number of issues with IE11. More than I can address in time for 1.0 - unfortunately no-one reported any of these issues earlier in the beta. Will add a note to the release notes.
I've fixed the main issue with IE11 - nodes appearing on the wrong tabs, and the fact the logo in the header was wrapping when it shouldn't.
Of the other issues @kazuhitoyokoi mentioned (missing/wrong sized icons - due to us moving to SVG icons) they are entirely cosmetic and can be addressed later.
@knolleary
I appreciate your fixing! I think that other issues are ok for v1.0.0. We're really looking forward to using v1.0!
@TotallyInformation
Thank you for the report about IE. 
Today, I just came back to my office from holidays.
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I only ever use it if nothing else works - though it can be useful to highlight minor structural issues in web pages that other browsers deal with internally.
Personally, I don't care whether NR runs on IE11 but you may still get some enterprise users who have no choice.
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Same issue with me. Installed the modbus library in the latest version and get the same error. Followed your action and now it’s working fine. Did you informed the author?
