Why can't I get the star systems unlocked in the galaxy map in Mass Effect 3?

I have finished all the current side missions and have side missions waiting for me but the systems I am being told to go to do not show up on the galaxy map. Is it necessary to complete certain priority missions before they will show up? I am on my second play-through and several did not show up in the last play through either.

AllmightyBanjo2012-03-12T02:50:06Z

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You said it yourself: You need to do certain priority missions first - the bad thing is that some systems are not that easy to spot on the map (at least I have that problem) and of course while the Hades Nexus is pretty easy to find it is harder to find the Ikune system as the game does not tell you what cluster it is in...