The crop tool does nothing. This may be the same as the closed bug 2902571
I open a few .tif files and choose tools->crop.
In the crop dialog I specify values for x y w h and click apply and nothing happens.
The following code at line 8911 in the crop function returns because get_selection returns nothing.
my $sel = $selector->get_selection;
return if ( not defined $sel );
A partial workaround is to 'edit'->'select'->'all' after loading the files. This seems to make get_selection work sometimes.
Ubuntu 12.04 and gscan2pdf 1.0.5