Blackberry 9930 with Operating System 7.
When I browse to en.m.wikipedia, the field for typing a search term is covered by a thick dark gray bar.
When I click on the dark gray bar, the mobile menu pops into the left side of the display, and the right side of the display is covered with a translucent white haze. Still, no search field.
When I click on the translucent white haze, the menu goes away, and where the search field is supposed to be, it's still covered by a thick dark gray bar.
I've tried reloading and varying my font size, but to no avail. It's been like this for a couple of months.
My only workaround is to use desktop wikipedia on my old phone.
I acknowledge that the mobile search field had a problem last year, also. If I clicked in the search field, I wouldn't get a cursor, so I couldn't type in to the field. That problem was fixed after a while.