Arrowheads not filled

Every month or so one of my AUtoCad 2014 files will not keep its arrowheads filled. The DIMSTYL setting is set as filled. But, my dims. and leaders loose their fill when I use grips to adjust them. And most of the time I'm not doing anything; and they 'go blank'. Only closing and reopening the drawing seems to work; but only temporarily.

                              Thanks for any help, LL