If DDgui_FileDialog finds an empty directory - it doesn't display the usual "..", but it does crash if you click in the window.
What filter string did you use? It worked for me.
I was using "*.*"
I think I know why - the directory displayed (Application Data) doesn't actually exist as a proper directory - its a symbolic link, and thus nothing gets displayed when selected...
but... there must be an .. directory. Or that not present then? That would be really bad.
There is directory, but as in DOS, it doesn't display anything... It should be easy enough to deal with - once I've had a look at it :)
In order to make sure at least the back symbol is present (there is no point in opening the link to see where the directory) actually goes, it will be worth adding the following code at line 3413 in DDgui_FileDialog% :
IF num_dir%=0 AND num_file%=0
DIMPUSH files$[],".."
num_dir%=1
ENDIF
This will let people access the directory, and go back.