Many folks have said they have switched over to rooting cuttings in sphagnum moss in bags or plastic shoe boxes -- in part for some mold-resistant properties they believe the moss to have.  I've been trying it out here and there over the last two months on various cuttings and I still seem to be getting mold -- even if I first scrub the cuttings in antibacterial dish detergent and a bit of bleach.
    The obvious (and probable) answer is that I'm leaving my moss too damp and not airing out the shoebox enough.  (...although one of the things that attracted me to this shoebox method is that people seem to claim to "set it and forget it" and things work out...)
    It just so happens that I'm using sphagnum moss that has been sitting out in a plastic bag on a high shelf in my garage for possibly about 8 years.  Could it be that the mold-resistant properties decay over time?  Or could it be that the moss just picked up a bit of mold over all that time sitting on the shelf (double bagged)?  Or perhaps my cuttings were too green?  (Often the mold was near the leaf scars...)  Or is the moss just too damp and not getting aired out enough?

Are you using chopped moss?  I use chopped very dry, damp, not wet, I have never had a cutting get mold.  I do not open the box for 10-12 days, keep them in a semi-dark corner. I never wash the cuttings, they may or may not be wet from soaking, does not matter.  Works the same for greenwood or hardwood.  Other than that, not much else I can tell you.

It is labeled "long fiber sphagnum moss" -- as opposed to the shredded peat moss that is often used as a soil amendment.  I think "chopped" is the same stuff, just in smaller pieces...

Danny,
  How do you prepare your moss so that it is "very dry, damp, not wet?"  I soak it in a bit of water and try to squeeze it out -- but I suspect it is still ending up too damp.

The stuff that is harvested from the Northern US is a lower quality that Chilean or New Zealand. Which are lighter colored and do not break apart as easily.
I was getting a little mold in my box through the summer but I think that was more from high temperatures.

I have used and re-used the New Zealand Sphg, moss for almost three seasons.

If you don't put it on a shelf, then shelf life doesn't matter, no?  ;-))

True dat, Jon!  That sphagnum moss was left over from long ago when I had the "orchid bug."  Now I have the "fig bug!"
I'm just wondering if I'm causing my own problems by using old moss --- or if the root of my problems lie elsewhere...

I would think that if the moss had gone "bad" that it would be visually apparent: if it god moldy, or whatever. I have a bale sitting ut in the yard (almost a year now) and it doesn't seem to have any signs of ill affects.

Not knowing about the real SM shelf life; my take is that if virgin and bone-dry, it may last for many years.

As far for that already used left-overs, e.g., for rooting purposes; I 'get rid' of it by
mixing 'some' of it with the soil in the next stage of potting-up a rooted fig twig.

I put a layer of sm down, spray mist it, another layer, spray mist it and put the cuttings in.  Its really the humidity that does it.

Was at Lowe's to buy some Sphagnum moss and they had 2 cubic bags.  Didn't need that much and ended up buying a small bag of Miracle Grow Sphagnum.  Was preparing some fig cuttings and saw what looked like looked like timed released fertilizer.   Sure enough the fine print said with Miracle slow released fertilizer. Didn't think I would need to read the label on on Sphagnum moss.

Only if your going to smoke it.