  The Debye and Meissner screening masses of the gluons and the photon in
neutral and beta-equilibrated dense two-flavor quark matter are calculated. The
results are presented in a general form that can be used in gapped as well as
gapless color superconducting phases. The results for the magnetic screening
masses indicate that the system develops a chromomagnetic instability. Possible
consequences of the instability are discussed.
