invalid sessions

Your phpBB Version: 2.0.
phpBB Type: Integramod 141
MODs: No
Your knowledge: Advanced Knowledge
Board URL:
PHP Version:
MySQL Version:
What was done before the problem appeared?
What was done to try to solve the problem?
De.scription and Message
Hope somebody can shed some light on this?
When members are posting either in the forums or by pm quite often they are getting "invalid sessions" comming up on submit, usualy if you click back and re-submit it will then send but the problem is whats actualy cousing this?
phpBB Type: Integramod 141
MODs: No
Your knowledge: Advanced Knowledge
Board URL:
PHP Version:
MySQL Version:
What was done before the problem appeared?
What was done to try to solve the problem?
De.scription and Message
Hope somebody can shed some light on this?
When members are posting either in the forums or by pm quite often they are getting "invalid sessions" comming up on submit, usualy if you click back and re-submit it will then send but the problem is whats actualy cousing this?