Drop down boxes in Write & Calc

If I wish to change font in a writer or Calc document I simply select the new font from the drop-down box in the Formatting toolbar. Trouble is that the new selection shows in black with a green background over the old one. For example if I open the document in Baskerville and wish to change to Arial, the change is made, but the box shows “Arial” in black-on-green sitting on top of “Baskerville”. So it reads “Arialrville” with the first half in black over green and the second half in black over white. To show it properly I have to save the document and reopen it. What’s wrong, please?
LO, Ubuntu Mate 1.8.1, Ubuntu 14.10

May I propose to file a bug report here: https://bugs.documentfoundation.org/
Please note that for selecting the LibO version you need to scroll the Version list up

Bug entered 25/2/15 (or 2/25/15 depending on how you look at it). No 89648