Writer does not show formula

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I am Using LibreOffice version 5.1.0.3 When I open a Writer document made with an older LO version some formulas made with Math and included in that Writer document are not shown. I have to double click on the place where it should be displayed in order to let it show up again. Together with this formula problem, there is also a scrolling problem. Using an older LO version 5.0.4.2 this problem does not show up!