Very odd....it will be interesting to see what you discover from your own scan. Colour on the margins of the film might tend to exclude a major negative processing or film problem.....but presumably the frames look different to those of known good negatives from other films?
Originally Posted by Peltigera
Although, if the films either side of yours were OK, I suppose the filtration or scanning of yours could still be wrong (assuming it's the type of minilab where films are put through one-by-one). If the lab are co-operative, would it be worth asking them to reprint some of the negs, see if they can identify any issues?
Overexposure would likely affect all the colours, I've never heard of it bleaching-out the picture to one colour. Silly question....you didn't leave a coloured filter on the lens? (Even so, the lab printer should try to compensate for it.)