I have Gretl 1.76 and experience problems with keyboard shortcuts. For example when I create a linear regression model and want to select Forecasts from the Analysis menu and press Alt-A to access the Analysis menu the program crashes. When setting sample range and pressing OK by pressing Alt-O the sample range is not actually set. I think there are also similar other issues with shortcuts.
Some shortcut issues have been fixed in the latest gretl
release, 1.7.8. However, the specific problem that you
encountered with Alt-A in the model output window was
indeed a current bug, now fixed in CVS and the MS Windows
snapshot, at
http://ricardo.ecn.wfu.edu/pub/gretl/gretl_install.exe