I have this problems in Maya 2015.
I can't select any Edge on UV editor.
Normally, when I open UV Editor, meshes UV are in white wireframe, but if I try to select edges by RMB/Edge, the all wireframe becomes blue and I can not to select any edge. It happens even if I re open scene and even if I don't have any Tools selected.
(By the way, if I select a tool, I don't know how to deselect this tool to return to initial state...).