Could it be? Finally?!? From U28 Release Notes:
* Fixed an issue that caused the mouse wheel to get stuck in First-Person View when interacting with a bag.

One of the smallest, yet most-annoying UI bugs is finally slain. It irritates me so much when I can no longer zoom in/out with the mouse wheel. I'll be *so* happy if this works!
\o/

Thank you, Devs!