Thank you for providing your system specifications.
At this point I've performed additional research on this matter and have spoken with our Project Development team to confirm. Though NinjaTrader can run on a 4K monitor it was not designed for 4K monitors and is not optimized to do so. This does mean that running a 4K monitor can result in odd behavior as you've experienced.
Therefore, you can certainly use a 4K monitor we cannot confirm that it will work perfectly with the platform.
At this point if you experience these kind of problems we suggest to reduce the display resolution of the affected monitor from the system settings as a work around to resume normal functionality.
Please let us know if you have any additional questions.
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