This is annoying problem with Safari and Youtube. I don't know if this is an web extension problem?
As the question states if you look at this image there are ? marks on a channel image which makes it browsing experience broken and a nuisance for me. However today when I write this post the images are showing but I have a feel the problem may come again.
Are you running any anti - virus programs? Using a VPN?
Try setting up another admin user account in System Preferences/Users & Groups to see if the same problem continues. Please post back on whether or not this worked. Also try the Safe Mode. Please post back on whether or not this worked.
Isolating an issue by using another user account
If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown. If the log won’t post, try posting it in Pastebin and provide a link in a reply. After pasting the report in a PasteBin page, go to the top of the page, and copy the address in the URL bar. Paste that in a new reply. Pastebin
Etrecheck – System Information
Web site version if required. https://etrecheck.com
Are you running any anti - virus programs? Using a VPN?
Try setting up another admin user account in System Preferences/Users & Groups to see if the same problem continues. Please post back on whether or not this worked. Also try the Safe Mode. Please post back on whether or not this worked.
Isolating an issue by using another user account
If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown. If the log won’t post, try posting it in Pastebin and provide a link in a reply. After pasting the report in a PasteBin page, go to the top of the page, and copy the address in the URL bar. Paste that in a new reply. Pastebin
Etrecheck – System Information
Web site version if required. https://etrecheck.com
The problem still occurs in Safe Mode/Boot and I tried using In-Private Browsing in SM and the problem still exists.
I think that this problem occurs when I use my MacBook in School WiFi as it may block some data from the Internet. Also some channel icon appear but not a lot.
Etrecheck Report:
Based on what you posted, it appears the school's WiFi is the problem.
Try taking the 2 items below out of your login items, restart the computer, and see if there is any change.
[Not Loaded] HotspotShieldHelper (App Store - installed 2019-10-22)
Modern Login Item
/Applications/Hotspot Shield.app/Contents/Library/LoginItems/HotspotShieldHelper.app
[Not Loaded] StartAtLoginHelper (App Store - installed 2019-10-22)
Modern Login Item
/Applications/Hotspot Shield.app/Contents/Library/LoginItems/StartAtLoginHelper.app
If you aren't using the school WiFi, do you still have the same problems?
The Etrecheck report didn't post.
Yes. It works normal on normal WiFI in contrast to School WiFi which may be blocking certain data which may be needed for YT Channel Images.
Etrecheck Report: https://pastebin.com/KD4NnsAc
Safari not showing Youtube channel images | Safari 13
