Why am I loosing mouse control when I set the preview to full in any of the four quality settings? The video plays but everything appears to lock- up until the project plays through. All events are still pictures, no problem with video only photos.
Still images use a LOT of system resource, and it may be that you don't have enough system resources. If the images are .tif, this alone can eat up most of what your system has to offer. Also, if you are setting Preview to Full, you are likely using all your graphic's card's capability and if the GC is sharing resources with the mouse, that could also cause the mouse to lose smooth control.