I'm not sure what I did to cause this, but adding a new file or package in IntelliJ now doesn't add them to subversion, and I have to add them manually via right-click -> subverion -> add.
Is there a setting that controls this behaviour?
Go to File -> Settings -> Version control -> Confirmation -> When files are created You're probably looking for "Add silently".
Note: In IntelliJ 6 or earlier versions this is done with File -> Settings -> Version control -> General Settings -> Add silently
If you've come here and the solution by Bozhidar Batsov doesn't solve the issue you may need to change the svn:global-ingnores in SVN Properties for the project.
Right click on the project go to Subversion | Set Property.... In the drop down select svn:global-ingores. Remove * from the list and hit OK.
