Text Box not updating formulas

[BL1]

I have formulas in A18, B18 & C18 that reference the numeric value in cell E1.
I also have a text box (ActiveX) that allows the user to input a value into cell E1 via the "LinkedCell" property.
THE GOAL is to allow the user to input a numeric value into the text box, the value will updated into E1, which will allow the formulas in A18, B18 & E18 to be calculated based on the user input into the text box.
THE PROBLEM is the formulas do not calculate/update when the user input into the text box (formula cells remain blank). I suppose i was expecting the user to input into text box and tab or enter out of the box to get the formulas to run, but tab and enter does not do anything.
I have done it up to this point without VBA, and not sure that I need it. I would like to do it without a CommandButton, but might have to.

Any help would be absolutely great!!!!!

Totally stumped here.

[TMS]

Maybe you could post your workbook or a non-sensitive copy?