"Others" tab in Manage Checkouts form

During 'Manage Checkouts' some of my checkouts are listed in the 'Others' tab. Why?

If you have multiple workareas and you have the data checked out in a different workarea, this is expected behaviour - you can only modify the data in the same workarea where it was checked out. You can still use the procedure described below but any changes in the other workarea may be lost.

This also happens when the checkouts are in the current workarea but the local 'locks' corresponding to the checkouts have been lost (this happens if the local data is deleted manually or by another application, then restored with 'svn update').

To recover lost locks, use Tools->Show My Lost Locks in the Manage Checkouts form, then select the relevant data in the Others tab and use 'Recover Locks' 

You can also recover the locks manually from the Subversion command line:

 svn lock --force <files>