OS: windows 7 64bit
GPU: NVIDIA Quadro K4000
Broken: 2.70 19e627c
Short description of error
it seems that in some situation the default file_format gets changed to the auto_save_format
Exact steps for others to reproduce the error
im not entirely sure when this happens but what i did is set the default file_format to "AVI JPEG" and then rendered a animation with about 300 frames. sometime in this process the output switched and created png files and the movie was ending where the png files started. so i would suspect that the autosave addon was causing this switch somehow because ive seen that it changes the default format to its own and then back again.
so maybe there was some interference where the default could not be restored and it sticked with the autosave format:(