I've talked to a few clients recently who are having issues with Text/Menus/Ribbons/Palettes scaling strangely in AutoCAD with a high resolution monitor (higher than 1920x1080) or High DPI.  Similar to the pic below.

Per Autodesk Support, "As per the DPI scaling with AutoCAD, current versions of AutoCAD (and other Autodesk products) are optimized for display in monitors with a resolution under 2000. When working with high-resolution/high dpi monitor on Windows 8.1 (and Windows 10) you may find that menu text appears smaller than expected, or may text overlap each other in drop-down menus.

The development team is aware of this issue and will be looking at addressing this in a future update or product release."

There is a workaround for now.

Revert the text size setting in Windows:
  1. Click the Windows Start menu and type display (or display settings) in the search field.
  2. Select "Smaller - 100%" and click Apply.
  3. Log out and log in to Windows or reboot the computer.

Disable DPI scaling for AutoCAD:

  1. Right-click the AutoCAD shortcut or the acad.exe program file and choose Properties.
  2. On the Compatibility tab, select "Disable display scaling on high DPI."
  3. Click OK.

Lower the display resolution (Windows)

  1. Right-click the desktop and choose Display Settings.
  2. Scroll down and choose Advanced Display Settings.
  3. Select a resolution closer to 2000 dpi (2560x1440 tends to be an acceptable resolution).

These changes make AutoCAD usable on computers with high resolution monitors, though AutoCAD might be a little blurry. If possible, please open a ticket with Autodesk Support through your Autodesk Account, or through http://autodesk.com/feedback to report this issue so that development will escalate the need for a fix for this issue.