Q: iWeb issues and yosemite?

Boot into the Recovery volume (boot with the Command + R keys held down), select Disk Utility and repair both the disk permissions and disk.  Reboot normally and try again.

If that fails try the following:

1 - delete the iWeb preference file, com.apple.iWeb.plist, that resides in your

     User/Home/Library/ Preferences folder.

2 - delete iWeb's cache file, Cache.db, that is located in your

User/Home/Library/Caches/com.apple.iWeb folder (Snow Leopard and Earlier).

3 - launch iWeb and try again.

NOTE: In Lion and Mountain Lion the Home/Library folder is now invisible. To make it permanently visible enter the following in the Terminal application window: chflags nohidden ~/Library and press the Return key - 10.7: Un-hide the User Library folder.

 

If you're running Mavericks or Yosemite  go to your Home folder and use the View ➙ Show View Options menu to bring the this window: