Cannot edit any tables in a drawing

I'm having an issue with editing any type of sw table: Revison, General, BOM, Weldment.

Excel based BOMs are ok.

If I start typing in the cell the cursor immediately exits and jumps to the first column on the same row. If I double click to edit it does the same as does pressing F2.

I thought that it maybe the keyboard but I have no problems with anything else within SW or external programmes.

Any ideas?

SW2010 SP0

SolidworksDrawings And Detailing