Spotted Thread Broke?

[88Center]

any URL past page 99 and I get "Forbidden" error.

ok ---> /53830-spotted-thread-99.html

no ---> /53830-spotted-thread-100.html
no ---> /53830-spotted-thread-101.html
no ---> /53830-spotted-thread-102.html
...

 

[fourwd1]

Known problem with several very old very long threads.
Sorry, no fix in sight.