I updated my firmware from 3.1.4 to 3.2 and when I try to do the RC end point calibration all it shows is gray bars. When I reload 3.1.4 I have no problems performing the RC cal.
My configuration is:
Specktrum DX-7 satellite rx (Rx is binding on both firmware versions)
Home built Quad with 3DR telemetry
3DR OSD video
About 10 flights on the systems