I run Windows-7 64bit. I installed the 2017a Gretl build. I went for other reasons to the "uninstall software: facility of the computer. I noticed that in the facility's list, appeared to exist two gretl versions, the one being what I had just installed and another saying "Gretl version 2016c" if I recall correctly, and of smaller size (around 72MB I think). I thought the latter was a left-over from the past and I uninstalled it. Then, while the Gretl 2017a icon still appeared in the "uninstall software" facility list, Gretl has disappeared from the Programs menu and all Gretl files I have created were no longer recognized. I re-installed the current build and everything returned to normal. No second Gretl icon appeared. This is technical but I guess it may be of some value for users like me to know (and so not worry about, just re-install) why this temporary "incapacitation" of the Gretl software may have happened, when an older version got erased from the computer. -- Alecos Papadopoulos PhD Candidate Athens University of Economics and Business, Greece School of Economic Sciences Department of Economics https://alecospapadopoulos.wordpress.com/