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The bug with the Advent Starbase's beam weapons not firing, even after the upgrade has been purchased, does not seem to have been fixed. I even reread the change log, and I found no mention of this being fixed (at least that I could see).
I apologize if this has already been reported.
The advent starbase does not have beams. Do you mean the lasers? They are not easy to see. Look closely.
I've been playing a big game with the Advent, and all 3 weapons appear to fire as they should. 
Maybe I am missing it. I thought that they had beam/laser things like the Radiance Battleship did. I guess I was mistaken about that.
EDIT: You're right. All three weapons are there, I just wasn't noticing them all. So I guess there is not bug. Sorry about that.
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