Tony I scanned via Plustek as a neg,did not adjust the histogram and no auto anything was on.It is possible that Dev died or contaminated etc, but the image as seen here is not the best to try and judge due to it being a positive.
It could be just a poor scan and without knowing how the negative actually looks it is very difficult to judge.
Did you scan as negative or positive?
Did you adust the scan histogram or allow auto operation?
Does your negative look anything like the ones shown in the image below?
Top row your image as posted here as a straight print from the neg - note the low contrast in histogram
Middle adjusted to a more 'normal' neg.
Bottom perhaps a little overcooked