DX Error messages

Hi, could someone please explain these error messages to me? [3056] Direct3D9: (ERROR) :Could not get exclusive mode when we thought we could [3056] Direct3D9: (ERROR) :Release Exclusive Mode Mutex Failed. [3056] Direct3D9: (ERROR) :Application attempts to leave exclusive mode on different thread than the device was created on. Dangerous!! [3056] Direct3D9: (ERROR) :Mutex 0x00000114 could not be released. Extended Error = 288 [3056] Direct3D9: (ERROR) :************************************************************ [3056] Direct3D9: (ERROR) :ASSERTION FAILED! File d:\builds\nt32_chk\multimedia\directx\dxg\d3d9\fw\enum.cpp Line 43: 0 [3056] Direct3D9: (ERROR) :************************************************************ What I''ve done is put the message pump in another thread, allowing me to code the game logic linearly. Thanks, eb.