When I use an "=" in a formula a caracter reprsenting a floppy disk is displayed. With my second computer (same libreoffice update and windows 8.1) the program freeze and I have to shut it down using the task manager
Make sure you have the font “OpenSymbol” installed. If you don’t have it, here it is: http://cgit.freedesktop.org/libreoffice/core/plain/extras/source/truetype/symbol/opens___.ttf