If you set up folders in VSS that are not in the Solution Explorer in the
IDE, you probably will run into the problem you described.  The issue is that
the folder is still readonly and since it is not in the IDE, it must be
checked out in VSS.

If you want folders in the Explorer, create them in the IDE and then when
you add your solution to VSS, the folders will be known to the IDE and will
be checked out from the IDE.  If you have a file checked out and can't write
to it, check the readoly property of the folder in which it resides.  If it
is readonly, then you will have to go to VSS to check it out, else just
uncheck the readonly property of the folder.

HTH
Les@KnowDotNet.com

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