I mean, I've forcibly refreshed quite a few times, and it's not working.

I got a new one today. "Resuming on page -1"

I'm at home now and I'm no longer getting errors. I'm logged in as normal and the forums are working as they should. I also posted in the thread that I started.

Hello,

Please email support@j-novel.club for further assistance with this.

Hello,

We had an issue where it would not load in horizontal mode. That has been fixed. Please try again.

@nohashtag

Hi,

I can’t say I see the same issue. On my iOS app everything loads just fine. All images and thumbnails.

Is it maybe your data? Could you toggle the WiFi on and off. Try cellular connection?

@mikathereviewer

Please send an email to support@j-novel.club requesting deletion.

@Raghav-Shankar-23mpsul
Bummer.
It'd have been nice if it were that simple a fix.

The usual next questions would be if you've cleared your cookies and then refreshed your browser cache?
Which are things I forget to attempt more often than I'd like to admit.

Well I tried.
Fortunately there is the "fall back" procedure in getting a code number via my email address.
Thanks!
Jim,

I had the same problem with Mercedes and the waning moon manga. Where it would just sit on fetching forever. Found out DuckDuckGoPrivacy thing was blocking the chapter from loading.

@morbelek Thank you very much for the input, it set me on the right path!

TLDR: For me, this is an IPv4 issue and with both (IPv4 and IPv6) enabled and properly working, things are back to normal right now. For both websites, j-novel.club and jnc-nina.eu, webreader pages load within 500 ms, downloads have >3MB/s and site-navigation is as any other.
I must have made a slip-up somewhere because the IPv6 DHCP server in the router was not configured properly.

The longer story: After reading about the issue with my ISP Telekom and cloudflare some more, I visited my neighbours who also use Telekom. To my surprise everything was working fine over there (used the laptop with USB booted manjaro). I noticed that Firefox shows an IPv6 address for m11.j-novel.club but on my side it always showed an IPv4 address, even with IPv6 enabled. After careful comparison between the router settings I finally noticed that the IPv6 DHCP server in my router was missing a vital checkmark:

After a restart of the router things sped up a lot and Firefox is now showing me an IPv6 address for m11.j-novel.club while using the webreader.

In the end it was two things:

The IPv4 only config I was using for the last couple of years suddenly stopped working properly (Likely due to the Telekom - cloudflare issue that is apparently known). I made a mistake with the IPv6 config last week.

If this or a similar issue comes up again I'll get back to it, but for now I consider the issue resolved.

Thanks again for the input and I hope this may help others with similar issues.