The optical coating may not be correct for the 532nM pass/reflection. Most are 515 nM +/- 15 nM. There may be polarization issues with a cube. Would ask Spec or Marconi to step in. The dichro's I have are great as far as coatings and quaility.....not much loss to even mention....less than 2%. They are from an unknown manu. I have read good reports about the Edmund dichro's but have a high price tag. Might check with Spec to see if there are any available.
You are the only one that can make your dreams come true....and the only one that can stop them...A.M. Dietrich