I am having the same error message when trying to add a new topic.
Server Error in Forum Application
An error has occurred while writing to the database.
Please contact the Forum Administrator.
Support Error Code:- err_SQLServer_save_new_topic_data
File Name:- new_post.asp
Forum Version:- 10.12
The forum has been idle for some time so this may not be a new error. It was upgraded from 9.x quite recently.
It is on the same database server as before - SQL 2008 R2 (Standard or Enterprise).
Also happens when replying to a thread:
Server Error in Forum Application
An error has occurred while writing to the database.
Please contact the Forum Administrator.
Support Error Code:- err_SQLServer_save_new_post_data
File Name:- new_post.asp
Forum Version:- 10.12
Any clues?