Sounds like a background error is occurring during the load - probably pops up somewhere during the framework processing (if all scripts display the same behaviour). Can you hit F12 and check for an error message in the console? That would help narrow it down.
Have you tried just refreshing?
Yes, the pop up reappears each time
Have you tried disabling adblockers and similar extensions?
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I just tried disabling all extensions (except TamperMonkey obviously) and the popup still appears
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I would guess it’s a corrupted cache or indexeddb, or maybe when a user changes their apiv2 key. I’ve seen something similar at least once, and clearing cache (and/or indexeddb) solved it.
I would also recommend looking at the Network tab in devtools, because it will show what happened to the API query for user info.
Chrome cache cleared. Still popup.
I never changed any api key.
However, I don’t know what indexeddb is, nor how to clear it.
Don’t know neither how to look in the network tab in devtools.
If you tell me how to, I could try all of this.
Next thing I would try is to explicitly log out of WK and log back in. There might be expired credentials in the background or something? I would expect a cache clear to already take care of this though (did you have to log back in to WK after the cache clear?)
I did log out : no changes.
After the cache clear I had to log out, indeed.
I already tried to close and reopen Chrome, and to restart the computer : no changes 
I’m seeing the same thing here on Firefox 78, Tampermonkey beta 4.11.6115. I see the same thing with the non-beta.
Console:
I’ve also tried clearing my cache and I tried a new browser profile
Try getting rid of SRS Level Progress
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But that’s one of my favourite scripts
I still see loading data on every page load, it is faster now though.
If it means anything, I see the exact same thing on wkstats (v2) - which takes a good 30 seconds to load data
You should. WKOF needs to update its cache.
Does it still work?
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I get that, it’s just I’m sure I used to only see it pop up every now and again 
I’m probably just remembering wrong.
Thanks~
Aye, works perfectly so far as I can tell.
Strange. I though it was one of the scripts that broke when the author disappeared. You aren’t using its replacement?
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As for me, I have no other scripts that a leech script. I tried many of them as said in my first message
Well, I am now! Thanks, I hadn’t seen this ^^
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Looks like you never got an answer to this. Network is the 4th tab in the devtools (step 1 in image)
After you open it, hit Ctrl+R to reload the page and capture all the network traffic. (step 2 in image)
There will be a long list, but once it stops loading more, hit the red “record” button in the top left of the tab to stop the recording and look at the results (step 3 in image). From your error, it looks like the user call doesn’t get a response.
Once you find the request, the mini section on the right has tabs to look at HTTP headers, the received response, etc. This information could help to narrow down the problem. Your console indicates the JSON response is terminated unexpectedly - usually this means no response at all (or a 404 return status or something), but it can have different causes.