(provided you use Xcode 4) What is your SVN ignore pattern? Do you have a global one or do you prefer to set it via propset?
I have the following in my ~/.subversion/config file:
global-ignores = *.o *.lo *.la .*.rej *.rej .*~ *~ .#* .DS_Store *~.nib *.mode* *.pbxuser CVS _*.java *.perspective .LSOverride *.xcuserdatad
I added the last one (*.xcuserdatad) recently for Xcode 4.
I added xcuserdata and *.xcworkspace to mine. Sorry, don't have wifi on my laptop or I'd paste the whole line in.