Checking console logs, seems like the problem is coming from theme plugin something:
caught (in promise) Error: Could not find module `select-kit/templates/components/combo-box/combo-box-header` imported from `discourse/theme-91/components/locale-combo-box-header`
Probably a theme component is using outated/depcreated code, that causes the loading to crash.
I created a blank theme using light pallete with no components active. Same problem. Woupd I need to disable the other themes? I have set the blank theme as default.
Hum, the things is I no longer see the error I reported above and the site loads for me… Secondaly it reminds again Google Analytics old version issue, of which the bug would appear sometimes and sometimes not… Do you use GA, can you just disable from admin settings?
Is that enabled by default? if not then sgouldn’t be present
EDiT seems fixed now. Private browser seems to have breakage. But Whale good.
Not sure what the issue was exactly. But have had this sort of thing before after using the nee web ux for upgrading. Other site running stable has not had this condition arise that loads a seperate docker window.