Copy the exact text of your region from the Region combo-box.
Change the region by opening the combo list, so that something in the "Examples" section changes.
Paste the text from step 1 into the Region combo-box and either choose it from the completer or just press Enter.
Then the locale doesn't change (see the "Examples" section). You should use the mouse wheel inside the combo-box and change it one step forward and then backward again.
Steps to Reproduce (for bugs)
Enter
.Then the locale doesn't change (see the "Examples" section). You should use the mouse wheel inside the combo-box and change it one step forward and then backward again.
Possible Solution
Will fix it soon.
System Information