It appears all is not well with the Venus Express probe:

An instrument on the European Space Agency's Venus Express spacecraft is stuck, rendering the device useless until mission controllers can move it to its proper position.

The instrument's main purpose is to measure the temperature of the atmosphere and surface of the planet, potentially spotting signs of volcanic activity and weather. Controllers are still working on different fixes for the problem. The probe carries seven instruments, so the failure of one will not cause a failure of the entire mission.