I was browsing around about Lomo 100 CN film and stumbled upon another Ektar Case. In the link, 3rd shot of the sunset, there is a faint "15" frame marking as well as some clumpiness from the paper texture looking close.
http://www.pentaxforums.com/forums/...andscape-lomo-100-backing-paper-imprints.html
Again, the third one. Exp. 09/2016 (produced in 9/2014 then?). Indeed the Lomo ones are really heavy handed.
Another note, I recall reading a thread around (perhaps it wasn't here, instead at RFF) about Ektar not having one of the set of frame numbers printed in the backing, as a user loaded it into a Bessa 6x9 and didn't see anything for the red window. The relevant part in here was that Kodak told him something about them revising the printing because for some reason Ektar had a different set of numbers, lacking the row for that format.
I tend to keep exposed rolls a while in a drawer in my desk awaiting batch expedition to the lab, so far no problems with Portra. I live in the Mediterranean coast and we're often around 60% RH. Curious about triggering the issue.