In the Trello app for Windows 10, when viewing or editing a card, the text in the card is blurry whenever the card is so big/long that you need to scroll to view the entire card. It seems the blurriness arises instantly when the scroll bar appears. The issue seems to only be affecting the Trello app for Windows 10, not when using Trello in a browser (tested Firefox and Chrome with no such issue).
See video here (HD quality neccessary to see the issue): https://youtu.be/z2kmTs7-Dbk