Everything works as it should but all the buttons turn black. Passing my cursor over them turns them back, although not all.I am using LO version 6.1 although this is a problem that has carried over from earlier versions. My operating system is windows 7…OK I think your questions may have answered my questions. I set LO to maximum default in program selection (if that makes sense) and so far so good…though I may be back, thanks.
If you want get a serious answer, then please add (by editing your question) more information about the LO version you are using, OS and it’s version you are using, OpenGL enabled?, Desktop Manager (if using Linux)- Resolution, Color Depth, Display Driver, Graphic Card etc.
Please test changing OpenGL status on Menu/Tools/LibreOffice/View.