Developed a roll of Portra 400 this morning which I shot out of a recently CLA'd Minolta Autocord. This is the second roll of film I have put through it, but the first time I've used a flash with this unit. First roll of film had no issues. On this second roll, first 8 shots were in daylight without flash; no issues. However, the last four I shot indoors with a flash (Metz 45 CL-4). I've used this same flash with another Autocord with no issues. But today, the last four frames that I shot with the flash produced no image whatsoever. I distinctly remember the flash firing on all four shots, which were at f/11 and 1/100th and the Metz flash set at that aperture too. I checked the camera, and the shutter appears to be operating as it should. I thought I had placed the flash synch switch on "X", but on checking the camera, it may have moved more towards the middle "F" (there are no 'clicks' between the "X", "F" and "M" on this unit). Could that be the cause of the issue?