My PDF manual preference is set to A4.
When I click on Help:Users' guide (pdf) Gretl downloads the A4 version of the User's guide correctly.
Next click on Help:Command reference:PDF and Gretl complains that it can't find the file : No such file or directory.
The error dialog window shows:
Applications/Gretl.app/Contents/Resources/share/gretl/doc/gretl-ref-a4.pdf: No such file or directory
In reverse the same happens. First click on Help:Command reference:PDF and Gretl downloads the A4 reference manual.
Then click on the Users' guide PDF and Gretl complains that it can't find the file.
If you quit Gretl after the first download and then restart Gretl and repeat the procedure for the second manual: file is downloaded successfully.
Running Mac OS X 10.5.6 (intel)