#129932 **
    'p4 submit' could fail when 'p4 integrate' mistakenly
    attempts to branch from a deleted revision if that
    source file was readded and that readded revision was
    ignored into the target file.  Fixed.  (Bug #24663)

#128837 **
    The server no longer exits after 10 consecutive attempts
    to accept an incoming connection.  Usually the reason for
    this is that the computer is under configured and its
    simply a server resource problem.  In some cases the
    problem can be on the client end,  because of this the
    server now sleeps, then continues to retry.  (Bug #24156).

http://www.perforce.com/perforce/doc.061/user/relnotes.txt