Very Odd,

We use only 'crimped' cassettes so they do not 'pop'. Even if the cassette got damp and froze it should not 'pop' the top unless it was actually full of water?

When you say they were 'in the box' where they also in the plastic tub ? if so it is unexplainable
( send me the batch number ).

Simon. ILFORD Photo / HARMAN technology Limited :