Erratic Loading of MTS image files Blender2.74

Blender 2.74 occasionally getting confused and reports “file … MTS could not be loaded” when adding Image to VSE. Blender 2.73 reports file error also but has never been able to add MTS images. Both Blender versions are loaded on the same machine…Is that a problem?

Could I be causing “session” issues?

Blender 2.74 will initially import MTS video…Quit Blender…Start Blender…Error file MTS could not be loaded (same, or different MTS file)