Cell content disappears on unfocus

Hi,

I've just started working on a new project, where I need to update some existing dashboards.

I can open up the dashboards fine, but if I select a cell, click on the formula bar (Just place the marker at the end of the formula, not highlighting it), and then click on a different cell, then the first cell becomes empty.

I can't use undo or in any way get the cell contents back, it just disappears.

Has anyone encountered this before?

I am using Windows 7, Office 2013 32bit and Dashboards 4.1 SP4.

Thanks!