The messaging system still has some problems, in case you were unaware of them.
On Thursday, I sent a message to a seller, because her gig indicates she wishes to be contacted before an order is placed.
No answer on Friday. No problem – maybe she’s busy.
No answer over the weekend. Again, no problem – perhaps she doesn’t work weekends.
I checked this morning, and my message isn’t even in my message section. So, we can be reasonably sure it never reached hers.
There doesn’t seem to be any rhyme or reason to which messages get through and which don’t. If you’re expecting a reply from someone, and it’s been a strangely long time, you might want to follow up with another note. That someone may not have received your earlier note… or s/he may have sent a reply that you didn’t receive.