Hmmm..very interesting. Now that you've mentioned 135i, here's a similar thread
Windows and sunroof open this morning ??? - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (M1 / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
They are saying one MUST depress the key fob for a certain period of time in order to windows go down. Tomorrow morning, maybe do some self tests yourself? (i.e holding the open button for 5-10 secs, may be?)