Thanks for your report, however your ticket is incomplete and therefore not helpful in its current form.
Please add all needed information according to this list:
- The required parts of the Status Report from your JOSM.
- Describe what behaviour you expected.
- Describe what did happen instead.
- Describe if and how the issue is reproducible.
- Add any relevant information like error messages or screenshots.
To ensure that all technical relevant information is contained, create new tickets by clicking in JOSMs Main Menu on Help → Report Bug.
Remember: This is a generic notice so we don't need to write the same stuff again and again. It may only apply in parts to the specific case!
You need to enable HiDPI support.