Created attachment 107805 [details]
Example of comment when mouse is hovered over the cell
Comments in spreadsheets are shown with transparent background and without border when hovering over a cell containing a comment and desktop effects with OpenGL 2.0 are switched on. Only the text itself has an opaque background, the rest of the box is transparent. This makes it difficult to distinguish the comment from the surrounding content.
Switching off desktop effects solves the problem. Also choosing "Show Comment" from the cell's context menu shows the comment with border, background and shadow.
Tested on Kubuntu 14.04 64bit, KDE 4.13.3, Qt 4.8.6, Intel Core 2 Duo.
Created attachment 107806 [details]
Comment when shown explicitly via context menu.
*** This bug has been marked as a duplicate of bug 75668 ***