Hi,
I just upgraded this week to axure 9.
In the beginning I thought my eyes were letting me down, but after some asking around, it seems a real and existing glitch:
The font we use all the time, Museo Sans, only has 2 available weights, 300 and 500 in axure 9 anymore. In the past (rp 8), 700 and 900 were working perfectly. But they have seemed to stopped doing just that.
The 700 and 900 options are still visible and clickable in the typography dropdown, but don’t change anything to the weight of the letters in te prototype anymore. 
Am I missing something?