ActiveX Textbox not updating until Design View is clicked

I have a lot of text boxes updating to match cell references via a macro. The macro is simple, it sets value of textbox to "", then sets it = to a cell reference (example below).

ActiveSheet.HTMLText99.Value = ""
ActiveSheet.HTMLText99.Value = ActiveSheet.Cells(5, 7)

The odd thing is when I run the macro, the values dont change until I click the "Design View" in the developer tab. Is there a better way to be clearing the values or is there an updating script i should be using?