I had the same problem, the in and out midi of my new keyboard not appearing, but when Reaper was closed and opened again the midi's were there. And everything worked.
Don't forget to have your keyboard connected before! you open Reaper.
It can have several: I have an Axiom in there, a Casio PX3, a Novation ZeRO and a Korg NanoPad
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Win7-64bit | i7@3,4Ghz - 8GBRam - ssd | Infrasonic Quartet | ZeroSLMkII - Nanopad | Axiom61 - PriviaPX3S | PRS & Takamine | a few vsti
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