Solved! Go to Solution.
Solved by IanMcClain. Go to Solution.
Most likely one of 2 things is happening.
1. Your trying to drag the new style from drawing A.dwg into drawing A.dwg.
or
2. Your dragging the new style from Drawing A.dwg to Drawing B.dwg but not moving your cursor off the Toolspace and onto the drawing area.
Also be sure not to release mouse button until a little rectangle appears next to cursor and drag slowly.
It's actually very easy to get Drawing A & Drawing B mixed up when copying styles.
If you still can't get this to work then try the "Import Styles" Tool included on the Manage Tab of the Ribbon.
Try dragging the style you want all the way to the name of the target drawing. It takes a second or to for the toolspace to scroll, but once you are hovering over the target drawing name the circle slash changes to a pointer with a dashed rectangle below it and will copy the style when you drop.
Another method is to hit the restore down window button so you can see a window of both drawings at the same time, then drag and drop to the window of the target drawing.