why glue points on MathType formula are invisible?

asked 2018-04-12 16:45:27 +0200

Hi,
I want to use glue points and connectors in DRAW to show relations between variables in my MathType formulas. But all glue points become invisible after placement. What`s wrong with me or Libre? Everything is OK with non-OLE objects. Is it a reason for the problem?

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