 , I'm afraid I have to report a triple cart disappearance.
, I'm afraid I have to report a triple cart disappearance.  After updating our server from DW20 5.2 to 5.2.1 (only change is the addition of AE) we returned to find that 3 out of the 4 carts had simply vanished.  One would probably conclude from that many disappearing all at once that it was more to do with the mod pack update and that's what I'm hoping it was.  I've replaced them and they've all been running fine for 3 real life days without any issues, so maybe it would be wise to pick them up and pop them in a chest if when you make any server changes so you don't lose them.
   After updating our server from DW20 5.2 to 5.2.1 (only change is the addition of AE) we returned to find that 3 out of the 4 carts had simply vanished.  One would probably conclude from that many disappearing all at once that it was more to do with the mod pack update and that's what I'm hoping it was.  I've replaced them and they've all been running fine for 3 real life days without any issues, so maybe it would be wise to pick them up and pop them in a chest if when you make any server changes so you don't lose them.Same here Tabs, I don't have torches, but the canopy seems to be working, knock on wood (pardon the pun). It may just be a coincidence though, but I am trying to keep track of it. I have a multi-block tree farm going as well that will probably provide enough wood to keep my boilers going if the cart disappears. At least it will buy me some time. Life is good when the cart farm is working.Since my cart has had both a canopy and torches between the saplings (to prevent mob spawn) I've had no more issues. It could well be a bunch of different things causing them to dissapear.
 I did also notice many many holes in the wood roof of our main base so there's clearly been some lightning storms.  Not sure whether to put a glass canopy over it and see if that works or whether it's down to "carts falling through the void" like recon_ says above.
  I did also notice many many holes in the wood roof of our main base so there's clearly been some lightning storms.  Not sure whether to put a glass canopy over it and see if that works or whether it's down to "carts falling through the void" like recon_ says above. 
Mine are running underground and they are still disappearingUpdate: Had a glass roof over the entire farm for 2 weeks now and NO cart disappearances.... I was losing on average 2-3 per week before. It's got to be the lightning then imho.

I had ClearLag on my server... Removed it and carts still disappeared.I used to play on several servers where we had the same issue with Steve’s Carts, and it turned out that the ClearLag plugin (which removes ground items) was to blame.
No cart disappeared after ClearLag was disabled.
Everything IS loaded 24/7. They mostly disappear after server restarts.Chunkload the whole TRACK = no disappearing carts
