If you play as Romulan, and you put the reman skin on your ship... it cost 1000 zen!! Before you need to log on your Fed or Kli pg and unlock the reman pg on tier 5 rom rep (if don't unlock, start a new project and cancelled it)
Interestingly, if you log out and in, go straight to the tailor, and AVOID selecting the model versions (Cerburus/Phoenix/Prometheus ship type, for example) and go straight to advanced, you can customize at your leisure, but it won't apply the changes.
No, no matter what you do, there is an arbitrary sum of 750 zen present, even before I try and change anything. This is the case for my Fleet Excelsior, Mirror Escort and a few others including TOS Connie etc. I have lost a fair chunk of zen and ergo money on this bug, so Dev's, is there ANYTHING to be done?