Experi ESM Proforma D2.zip

Gent's,
The attached file when opened on most pc's at work operates fine. However on one it doesn't.
On opening the green cells should let you click in them and do certain tasks (the tasks here aren't important). The cross cursor changes to the pointer when moved from other cells to the green ones. However on this one particular PC the cross cursor remains and the green cells are not active.
Any ideas how this is disabled on this particular PC?