Just upgraded to 10.3. Disappointed to find this simple and annoying, longstanding bug, that already mentioned a few times by others, is still not fixed. Must be a real tricky one!
Ctrl+Shift+U for autowhite balance works for a while and then for no apparent reason changes to Export the selected images, it also overwrites your current folder locations and settings in the export dialog. The only way to get CTRL+Shift+U to work again is to quit and restart LR.
A similar problem happens with Ctrl+U for Auto settings.
It used to the same on a Mac too, going back for at least the last 3-4 years.
These days, there aren't many apps, even free ones, where you periodically have to restart it to get it to work properly.
This is not the place to report bugs, as Adobe programming staff almost never show up here. The proper place to report bugs is:
Are you perhaps having an issue with your keyboard? Sometimes pressing U results in E?
All I can tell you is on my Mac, with the latest release, Control Shift U and Control U work as they should.
If it can't be replicated, darn near impossible for some of us to officially report it as a bug. Begging the question; what circumstance?
Ever try resetting prefs?