This question has been posed here several times and I don't really know of any way to fix it other than minimising iTunes to the mini-player again, then maximising it to show the library - this will bring the text back into something legible.
its not as much of a problem as it is annoying. I just hate when somethings a mass with my mac. apple has spoiled us we have to "give credit" to MS here. When I was a windows user, such things were considered normal
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