Known bugs ( --: unsolved, ++: solved ):

++  langdrill sigsegvs when negative values are introduced in 
    "Setup->Possible Answers" field.
    reported by YAMAGUCHI Nobuyuki <nobu@ee-si.eng.hokudai.ac.jp>
    solved on 1998/12/12

--  sigsegvs when you select a section with no keys.

--  the text of sense radio buttons is not correctly aligned.
    this should be solved at VDK level, not in my program, though.

--  program sigsegvs when a non-configuration file is loaded 
    instead a valid one.

--  program sigsegvs after pressing Start if a bad config file 
    was founded.

++  reload seems not to update the keys !?! Why ?
    on 1999/01/07 the problem seems to be solved.
    didn't do anything special for this.
    maybe it wasa no bug at all.

++  at reload the sense radio buttons are not correct set.
    solved on 1999/01/04

++  the new gtk+ require a fontset now.
	solved on 1999/01/04

--  because of using now a font set, the fonts can no more be changed
    at run time.

--  problems with clist when the clist is not visible:
    a. a warning at program ending if page "Solutions" was never
       viewed;
    b. selecting and deselecting some lessons when "Solutions" is not
       the active page and then moving to "Solutions" makes the scrolls 
       not to be updated. Making a new selection when "Solutions" is
       active, clear and reload the clist, thus solving the problem.
