"Method Not Implemted" message
 

Hi there,

Recently I have upgraded a forum to 3.8.3 from 3.6.x. Some users PM me the following error and I can't figure out the problem (the 404 error is clear to me). Some say they get in during posting a message in the chatbox, others while trying to view active users.

Can anyone be of help? Thx a lot.

Quote:
Method Not Implemented
GET to /index.htm not supported.


Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Addons/Plugins:

Automatic Thread Tagger1.2.

Cyb - Advanced Forum Statistics5.5

Cyb - Advanced Permissions Based on Post Count4.0

Cyb - ChatBox2.3
Cyb - PN System Verbesserungen1.4

Cyb - Top Posters In Month X1.5

Geburtstags-Glückwunsch-Thema1.5.0

Multiple Login Detector1.03
Restrict URLS0.1

Separate Sticky and Normal Threads1.0.5

Validate E-mail1.0

Weekly Stats1.7.0

Yet Another Mass Private Message System1.0.1