Need guidance in debugging this DNN issue - dotnetnuke

I'm a beginner with DotNetNuke and am having trouble debugging this problem. We are using DNN version 5.
On our local development machines our DNN site renders just fine. But we recently deployed to our test server and on there the site only renders fine when logged in as the Host. When viewing the site as just a normal visitor, all the styles are messed up -- it is just a white page with images gone and menus stacked vertically.
Clues / Notes:
We recently added a new .ascx and module
There are javascript errors, but it hard to tell what is causing them
You may ask about the Log Viewer screen. I looked there and I see exceptions, but I think the exceptions there are unrelated ( will look into this)
Works fine in our local dev environment
In server, only renders fine when logged on as Host
What are some steps I can take to try to debug this? Where else can I look besides the Event Viewer to see what is going on here?
Thanks!

What is the "new .ascx" that you deployed? Is that a skin page?
If something is wrong in the skin page and it is the default site page (under Admin > Site Settings), that would explain why non-admin users have issues, but Admin/Host users (where the site's Edit skin is working) don't have issues.

This solved it:
https://stackoverflow.com/a/3831419/614263
Due to permission settings it looks like IIS was blocking requests from the root to javascripts and css files. When looking at the Network traffic in FireFox I noticed that 404 errors were coming from "login.aspx?ReturnURL=../../blahblah.css"
Thanks for all your help and suggestions.

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I'm building my web app with React and already set the folder to "build"
Edit1: I've tried safari, chrome, incognito of both, and also hard refresh and empty cache still showing SITE NOT FOUND.
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As I mentioned in comments, try any other browser. Both the domains are working on my computer. It might just take some time for both to deploy and update the cache.
It's usually better to ask someone who stays far from you and maybe has a different ISP to test update website. I sometimes use Lighthouse and it turns up even it won't show up on my computer. (Apparently the older version gets cached).
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What's more bizarre is that we just spun up another Azure VM and created a dev site from a clone of the live site so we could troubleshoot further, and this problem does NOT occur on that site even though it's an exact copy of the live site files and database and both sites are hosted in Azure.
Does anyone have advice on what might be causing this or how to troubleshoot? My original though was to clone the page and start removing modules one by one to see if anything made a difference, but it doesn't actually remove the module when I click delete. I've read about ways to do this directly in the database, but I'd prefer to avoid that if possible, especially since we're not seeing the same problem on the cloned site.
Thank you!
Could you please see if any error appearing on the logs folder? You can see the logs here. /Portals/_default/logs/2021.02.01.log.resources? The log file name may differ based on website's logging configuration.
A similar thing can be seen from the Personal bar as well using Admin Logs.

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I have a website running on dotnetnuke. However, recently I can't do any action (edit content or page setting) on certain pages (the products subpges in www.midoco.com). Does anybody know why this happen?
What version of DotNetNuke are you on? Check the HOST SETTINGS page to see if you are using the HOSTED Jquery option, if so, try disabling that option.
It is probably a javascript issue, try firing up chrome developer tools (hit F12 in chrome) and check if you have a red X in the bottom right corner. If so, click it and check what causes the issue. I had some similar issues caused by single quotes insted of apostrophes in a language pack and spent a lot of time to find the issue. I just went to one of the pages and see you have an error in /engine1/script.js in your skin.

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I'm wondering if this can be related to the fact that when I install DNN I blank out the default installation option of creating a dotnetnuke application. I leave that option blank and create the installation in the root of my website.
P.S I tried the amended module tag suggested on SO without any luck.
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Above is the ribbonbar after I have logged in as a super user. The Admin option next to Host is completely gone
The site is running DNN6, the skin is only in the site portal folder, and it seems that all admin modules and options have gone away. Even the header, which I set in Site Settings (under Admin), went away!
Has anyone else had their admin options completely disappear on them? Is it possible that the skin is messing it up (all other sites use the same _default menu files and they work fine)?
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We've recently had this exact situation occur in one of our DNN sites. It turn out that one of the site's administrators had accidentally renamed the Admin page from within the "Page Management" section (it's easy to see how that could happen). The fix was to go directly to /Admin/Pages.aspx and change the "Page Name" back to "Admin" ... and it will show up in the ribbon bar again.
As a suggestion to DNN developers, I would recommend making the Admin page and its subpages impossible to rename....
Can you check the database to see if those pages exist? What if you try to navigate to http://website/admin.aspx do you see the admin page and all the child pages there?

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