If I have a sandbox checked out from repo A but my CVSROOT variable points to repo B, a `cvs commit' that fails at repo A will try committing to repo B.  Practical scenario:  Repo A is a removable drive that I forgot to plug in, and repo B is a backup or central copy of repo A.  On `cvs commit', I get a failure message for each directory in the sandbox, followed by successes at the backup/central site.  I think a commit should never automatically get attempted at a location not listed in CVS/Repository for each sandbox directory.