I have the same problem for v0.4.6. I have Julia running for a while on my machine (Mint 17.2 --> Ubuntu 14.04), but now I get this error message on startup:
WARNING: Error during initialization of module GMP: ErrorException("The dynamically loaded GMP library (version 6.1.0 with __gmp_bits_per_limb == 64) does not correspond to the compile time version (version 5.1.3 with __gmp_bits_per_limb == 64). Please rebuild Julia.") I had Julia installed via the ppa. I uninstalled Julia, removed the ppa and installed from the package manager. This gave me v0.2.1 :) Removed that. Added PPA again, install Julia. Same warning on start up.