Also make sure your transmit power settings are what you think they are.
- Plug in GCS OpLink into USB and check it and set it with aircraft switched off.
- Plug Revo into USB (with GCS OpLink disconnected) and check it and set it with USB only.
There is a bug in 16.09. You cannot change Revo RF settings via RF (don't use OpLink connected to GCS to do this). Revo RF settings must be changed via USB only. If you export Revo settings via RF, you will be saving the GCS OpLink settings as part of the save file. This means that File->ImportUavSettings and File->ExportUavSettings have problems when done via RF.
Simple rules to avoid problems: Always use just USB when making any RF settings changes. Always use just USB when doing File->ImportUavSettings or File->ExportUavSettings. Before someone complains about this statement, of course you can do these things if you understand what they do, but using these simple rules will avoid you needing to understand exactly what is going wrong.