Double Text in Dimensions when tolerance changed

Hi,

I work in millimeters doing architectural work, so I do not want decimal places in my dimensions. I found where to adjust the tolerence and did so, but when I applied it to the existing drawing , all the dimensions are now notated twice (one above the other) in the middle of the dimension lines.

So instead of, for example, "1500" I have "1500,1500" stacked on top of one another. 

If I create new dimensions it is doing the same thing. I see the option for dual dimensioning is greyed out, so I don't think it is to do with that, but I'm very new to Draftsight/ACAD so it could be something really simple.

 

By the way, is there a full manual available beyond the "Getting Started Guide"?

 

thanks heaps

 

Andy