After I upgraded to Unity 5.5.0f3. I can't select and edit values from Dopesheet from Animation window. Whenever I click a event of the timeline, then blue line is moved, but values are not changed at all. Curves works as well. Only Dopesheet is problem. I never experience this before. Or usage of editing is changed after upgrading? I'm using Windows version of Unity editor. Thank you for reading.
Still it bothers me.. Whenever I edit a frame, I have to input the exactly frame number to frame shown box. Why did Unity remove selecting a frame by mouse cursor? I don't understand it.
Ok, now I get it. Maybe it was me. I upgraded my OS to Windows 10 from 8.1, and it works perfectly. I also found that I have to click the top part of timeline. I'm pretty sure that it was little bit different in the past. (Or, Windows 8.1 problem) Anyway, now I can edit my animation data. Thanks for reply. It's solved. (FYI, still I'm using 5.5.0f3)