Limitations

Manual measurements are always drawn as 1 pixel with lines.
The measurements range for calculations is 3.6 x 10^û4951 .. 1.1 x 10^4932, that means 19 to 20 digits.
The maximum image size is about 7500 x 5000 pixels.
Bersoft Image Measurement (BIM) can open many windows simultaneously, showing Statistics, Charts, Results, images, etc.
After switching to another program and coming back to BIM, the stacking order of the windows opened inside BIM workspace may change and some window may move to the bottom, underneath another window, and disappear from view.
To make the window come back on-screen simply minimize or resize the windows that are visible inside BIM workspace, if some windows are maximized, restore them to normal state (not maximized), to reveal all the hidden windows below.
Alternative you can also press Alt-Tab until the window appears again.
If there are many measurements on the image (specially area measurements), drawing new measurements may get slower. In such cases, to avoid delays would be advisable to hide temporarily some measurements.