Whenever I try and add a comment, I get an error... but, the comment does actually get added. This is what I see.
```
Internal error
An error occurred on the page you were trying to access.
If you continue to experience problems please contact your Redmine administrator for assistance.
If you are the Redmine administrator, check your log files for details about the error.
Back
```
I am on a dual ipv4/ipv6 stack if that helps; I have seen forums which have broken access control lists and barf when faced with ipv6.