Symptom:
Certain characters are not reliably displayed in LibreOffice. Which character is visible depends on font size, font face, and even mouse-over. It looks as though about 40% of the letters have been randomly made white-on-white!
(This is really weird to track down, and extremely annoying!)
Debugging:
* I note that this affects LO, but not export to PDF. It also shows up in Abiword.
* The font needs to be about 18pt or higher to show this, eg Liberation Sans, 18pt. Font-face doesn't seem to matter.
* Mouse-over the text, or even changing the window size alters which letters vanish.
Test case (after hours of experimenting):
* Font-rendering: smoothing = None -> triggers this bug.
* Font-rendering: smoothing = Greyscale -> all is well.
I attach some screenshots both ways, to make this clear, showing both LO and the control panel. Toggling from one setting to the other makes the bug appear/disappear immediately.
I think the root cause is in libfreetype6, but it might be in Cairo, or elsewhere.
I'm using Ubuntu Wily-64 (having upgraded today from Vivid which also had the same bug)
I'm running this under Ubuntu-Mate.
Still present as of 5th August in latest Wily.
This may be more useful filed upstream:
https:/