'Put on' hanging up with just a cancel window

[micheus]

I attempt to do a put on. I select one outer face face from cylinder, RMB put on, LMB, select one side of faces on cube, RMB. I get cancel window and nothing happens.
Attached is project. I believe too many faces selected?

You didn't tell us how many faces you selected on the "cube", which I'm presuming it was more than one because of your question: "I believe too many faces selected?".

...and, in this case the answer is yes.

It's a tip for everything in Wings3D:

• A menu item uses to has multiple options (LMB, MMB and RMB);
  
• Always pay attention to the information line (it always shows us the options available);
  

So, for the Put On command we have these two:

• LMB option: "Move and rotate object, aligning the selected face to another element";
  
• RMB option: "Clone object on to one or more elements"
  

I'm sure now you

p.s. I'm moving this thread to Interface & Usage.