I have downloaded and installed QGIS. I would like to georeference an image using the core georeference plugin. When loading it no toolbar appears and the 'update', 'reinstall' etc boxes in plugin menu are also greyed out.
I had the same problem. This should solve the bug (QGIS 2.6 under Windows):
This is still a problem in QGIS ESSEN 2.14.0 I normally use two screens when I georeference and it seem that QGIS remember this somehow. To find my georeference window I have to change my setting to "extend this displays" despite not having a second screen hooked up. Then go fishing for the window to drag it into you working screen.
I had this problem as well in 2.18.3.
My solution was to go to regedit.exe, search for Plugin-Georeferencer. In that library you will find "Pos". The georeferencers position on the screen.
My position was: @Point(-1713 266). By changing this to a place within my screen resolution (I simply deleted the minus) the window appeared on screen at next startup and I could drag it in place.
Hope this helps.