Under Manufacter->Dimension/Draft-->Linear Dim
1)Pick a point
2)Pick second point
3)Pick a location for dimension value
After step 3 a numerical value showing up on screen, however, rich handed mouse and clicked done , the whole thing gone.
I thought when I hit Done it should display that dimension value! What's wrong? why disappear when hit Done?
You sure you have the layer visible that the dimension went on. Speaking from experience it is very easy to have that go to the wrong layer. Turn on all layers to make sure it didn't go somewhere you didn't expect.
Check the Options tab. This is where it defines what CLASS/SUBCLASS the dimension is going to be on. That is usually where I get burned if I forget to check.
No box to check, but the CLASS/SUBCLASS can be changed. If it is showing BOARD GEOMETRY/DIMENSION in the options tab, do you have that layers CLASS/SUBCLASS visible in your view? Again, I would turn on all the layers and check to see if it inadvertently got placed on another layer that is not visible on your screen.