Sounds like it has been dragged somewhere accidently, by default it would normally appear on the bottom left of your screen, below the "Layers, UCS, Posting" tab, try dragging that pane up or down.
Also look at the sides as it may have been "unpinned" which means it is hidden at the side.
Upload a screen shot with the "Measure Entity" checked as when that is checked the data pane should be permanently showing. What Build number of V26 are you using ?
Regards
Rob
:rainfro: :rainfro: :rainfro: