I have a question with a probable answer obvious to most of you. A few months ago I got an old used medium format camera. I developed one roll of film (Tmax 100) and it came out great. I haven’t done any darkroom work since the 70’s so I was happy. Today I developed a roll of Tmax 100 and the film came out completely clear. I did change developing solutions. This time I used Tmax RS. Is that not able to be used like this? The time, temperature and dilutions were right as far as I know. I know the camera works properly as one roll came out perfectly. Was the roll exposed somehow during loading or was something wrong with the development? I would appreciate any help anyone can give.