FACT:

if you add two or more FTP sampler to a Test Plan, you cannot set one to perform a "put" and another to perform a "get" action. When you change this settings for a sampler, the same setting is applied to the others.

I have experienced this with two or more samplers, even when placed under different thread groups.

SPECULATION:

this seems just a GUI problem. The "get" and "put" actions are performed correctly, you just cannot have both on the same test Frustrating :)

Thanks, ciao

Giacomo