Firstly, have you made sure you haven't clicked to a different tab on the docker? At the bottom of the screen, you might see a tab with 'mixer' written on it.
Otherwise, go to View -> Show Mixer (ctrl-M).
If still not, search for REAPER.ini, and look for mixwnd_x. Change the x and y values to something small so you see something like:
mixwnd_x=178
mixwnd_y=238
If that doesn't fix it... I don't know what will!
|