Ok, here's the problem. I installed activity locking where it updates some of the core Moodle files. However I've since realised that there's maybe a bug with it in that when locking other activities that are dependant on another beoing completed, even after that activity is completed, the others still are locked!!
So..... I tried various fixes and things I found throughout the forums, none of which worked! (using Moodle 1.8). I then thought that the activity locking for 1.9 may have a few updates which could help, so i backed up all necessary files then added the new ones.....again didn't work! So i changed them all back the old and everything was the same again...however now i've got ANOTHER problem!!!
It now says in notifications "Version mismatch: block activity_locking can't downgrade 2007101100 -> 2005092800!" and i can't get rid of it!! The version within the block php file is the correct version, the older one but the newer version is in mdl_block. if i change it to the old version again, the notifications page is then just blank!!! aaaghh! Is there somewhere else where i can remove from Moodle how it knows i've had a newer version in there??? How does it know this when all files are the old version and any tables are still the same too??!! Very weird!!!
Any ideas, anything at all will be much appreciated!!! Thanks!