This may be another Windows 7 problem, after the purple boxes were fixed
Since the patch yesterday, with dx11 enabled, most text has lost its dark outline/drop shadow, this makes it very hard to read against certain colours
All nameplates including interactable objects
The event/content guide in the top right corner
All text in the hero panel ( less noticeable as the hero panel is mostly dark)
In-game clock
Looted items that pop up on the right side of the screen are NOT effected and the text still has its shadow
Chat also still has a shadow
Text is normal with dx11 disabled