thank you very much! downgrade via SSH. Saved my life! kkk
I am using the 941ND tplink
I can confirm this bug on these devices:
TL-WR940N v4
TL-WA801ND v2
TL-WR741ND v1
All upgraded from 18.06.7 to 18.06.8 (sysupgrade via Luci while keeping settings), which broke Luci.
Fixed it by setting back to factory defaults, then reconfigured. Curiously, to exactly the same settings as before the upgrade, which then worked flawlessly.
So... are you now running 18.06.8 successfully - or are you saying you had to go back to 18.06.7?
(Just making sure I understand)
It definitely looks like the factory reset is fixing this for most in this thread...
Trouble is, for me, the factory reset is a pain as the WAP is in an awkward location 
- so I want to make sure I do this once 
18.06.8 is running perfectly after the factory reset.
After the broken upgrade I used ssh (firstboot) on two devices. On one ssh was deactivated, there I used the hardware reset button. So if your device is hidden behind your fridge make sure ssh is working before upgrading.
Or maybe try the upgrade without checking "keep settings". I have not tried that because I was hoping for luck...
After the factory reset you reach your device at 192.168.1.1, so also make sure that this IP is not in use by anything else.
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I have a sneaking suspicion: All here mentioned problematic devices are 4/32.
Maybe this is why nobody of the sysadmins can reproduce it.
I don't have a solution, but perhaps a workaround
With the same issue, I went to a new browser install (Firefox) and was able to access Luci OK whilst my "old browser" install continued to fail login (just sit without doing anything as above)
If I set the Firefox privacy settings as follows in "about:config"
- privacy.resistFingerprinting = true
- browser.display.use_document_fonts = 0
- privacy.trackingprotection.enabled = true
- webgl.disabled = true
then access fails again
If I reset the above to their original settings, login still fails !!
This is weird
Furthermore, i changed each of the above 1 at a time and logged out of the router home page and could log back in each time ... BUT when I restarted the browser I could no longer log in ie. it appears the changes only took effect when the browser restarted AND setting the attributes back to their original values didn't fix the problem
What's even stranger is that I have 2 routers (TPL 1043ND and TPL WDR3600) running the same version of OpernWRT, the 1024 has the problem but the 3600 does not
Go to a firefox install on which the above attributes have never set and Luci works - no changes on the router
Clearing the browser cache and cookies has no impact
Chromium is somewhat the same, sometimes works and sometimes not but I have not investigated why
Cannot currently explain this.
Try a new browser install and see what happens (I use LXD containers on Ubuntu PC so easy to create a new one for this purpose)
UPDATE
Deleting (or moving) the directory found at about:support / Profile Directory then restarting Firefox will clear whatever the problem was ... at the expense of removing addons, bookmarks, cache etc.
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