UI3 error when starting up with the latest update in v6

R

rocky500

Getting the hang of it
Jun 24, 2019
58
36
Australia
I installed v6 about 12 days ago.
With the the last update 6.0.1.23 (and previous one) I am getting an error when starting UI3 on another PC using Firefox/Windows 11.
Other previous updates to v6 were ok.

The box that comes up has this to copy
"Please COPY this text to share with support. Error in UI3 (v 315 / 6.0.1.23) ResizeObserver loop completed with undelivered notifications. at [0:0] Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0"

Anyone else see this?

screenshot if I cancel first warning. I can close this window and try again and then it works. But later on can get this come up again if I try again, but not always.
----------------------------------
I just tried Chrome and it worked the first time but on the 2nd attempt to start it gave an error again.
Please COPY this text to share with support. Error in UI3 (v 315 / 6.0.1.23)

ResizeObserver loop completed with undelivered notifications.
at http://censored_hostname/ui3.htm?t=live&group=index [0:0]

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36

Same again with MS Edge browser. Worked firs time but not 2nd.
Please COPY this text to share with support. Error in UI3 (v 315 / 6.0.1.23)

ResizeObserver loop completed with undelivered notifications.
at http://censored_hostname/ui3.htm?t=live&group=index [0:0]

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36 Edg/144.0.0.0
---------------------------

I went back to v6.0.1.13 and seems a touch better but did get the error twice out of 10 starts I tried entering UI3 on other PC.

The first screenshot is when I click cancel on the error box that firsts comes up.
If I click ok on that box it loads up and see all my cameras but still has the red box in the bottom left corner.
2026-01-24_063828.jpg

2026-01-24_070829.jpg
 
Last edited:
Something external is likely interfering. Try in a private/incognito window where there are no addons loaded. This also isolates you from any cookie conflicts in case you are accessing more than one web app on the same domain name (but different port number) and they are both trying to create a cookie named "session".


Also look at Blue Iris Settings > Webserver > Advanced. Authentication > Method should be "Secure login page only". The "Basic" and "Digest" methods are the ones that normally pop up the login dialog like you showed in the first screenshot, and those don't support automatic login which is inconvenient.

1769222043802.png
 
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Thanks bp2008 for the tips.
It seems to be all working fine again with one change.
I changed it before reading the above from bp2008. If it fails again I will try that change of yours. Currently set Method: Basic (plaintxt).

I just ticked the Enable HTTPS. That was off before.
I was thinking of logging in with HTTPS to see if I get the error but just tried normally with HTTP and it seems to work each time.
I updated to 6.01.25 and seems ok too.
Maybe refreshed an option doing this?
 

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Thought of something else that just changed if that might have any bearing.
I use Roboform to fill in passwords in my Browsers and it is coming up for renew.
So I had NordPass extensions in my browsers too to try an alternative to managing my passwords.
I seem to prefer Roboform, so I have disabled NordPass extensions in my Browser now. Had both running at the same time.
Not sure if it may have had any bearing on these problems I was getting logging in?
 
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