Might be wise to build a couple days into handling times.

[fern*wood]

I've never seen so many posts about ebay shipping being down.  I understand the urgency for those folks with sold items that qualify for TRS-plus to get that little discount, but otherwise, I would consider adding some handling days for problems like this.   Even a couple days would lessen the stress.  You can still ship same/one day if you wish, but hiccups like this won't cause hits to your shipping metrics if it isn't possible. 

[dhbookds]

Back in the dark ages, it was well understood that it was a good idea  to print labels for the wkend on Sun....or earlier......On Monday, shipping could be/would be down for varying lengths of time, especially during the Christmas season.    Wouldn't save a seller from late nite Sun/Mon sales, but did relieve alot of angst.....  Frankly, Ebay has improved since those times.......but it's still a good idea.