I'm using Ubuntu 14.10 and a few months ago I did some font tweaking so that my fonts look better, but it looks like because of that my multiselect fields only display ..., which makes it very hard to work with them (see the screenshot in the attachment).

I looked up the code and I saw that /usr/share/zabbix/js/multiselect.js does that in:

        function resizeSelectedText(item, text, obj, options) {
                // settings
                var settingLineHeight = 15,
                        settingArrowSpace = options.disabled ? 22 : 32,
                        settingPaddings = 3,
                        settingTextMax = 510;

                // calculate
                var maxWidth = $('.selected ul', obj).width() - settingArrowSpace;

                if (text.width() > maxWidth || text.height() > settingLineHeight) {
...

If I increase settingLineHeight to 16 all looks good, but I'm not sure if that is a good solution, or would it be better to set font size to be smaller in CSS.

Either way this is a big usage problem and I increasing settingLineHeight to 16 doesn't make the UI look bad at all (see second attachment).