It is a GPU issue with postman.
Some users may encounter issues updating in the Windows version of Postman 6.1. To resolve you must set the environmental variable POSTMAN_DISABLE_GPU=true. In order to do this, follow these steps:
- Open Advanced system settings
- Navigate to Environment Variables
- Add a new system variable and save by click 'OK'.
Some found that an update solve this for them.
Thanks!
Asheesh