There are some little bugs still in Powder Toy So here they are (those i have found):
1) Bug with U-shaped vessels (discussed in the topic "Water", too difficult to fix, but it is the biggest bug) 2) Acid shouldn't eat glass and burn (at least in my opinion) 3) Glass should melt at less temperatures. (I filled a glass vessel magma but first felt good) 4) Another bug with glass: it should fly apart into pieces when near the explosion, but it remains whole 5) Cline does not always work on photons 6) Photons should move in straight lines, but in all directions, not in 8 sides (something like Neutrons). At least I think so. 7) I think that thunder should fall quicker 8) Thunder creates a strange endless source of current, when touches the metal
EDIT: 9) It would be better if groups of elements will be switched by clicking on the icon, and not by hover your mouse at it.
Write if you have found some other bugs. So, we're waiting for the moderators to listen their opinion on this matter ...
Clone not producing Photon could have something to do with how Photons can pass through clone.
If you make a stamp that includes a particle of clone that currently has a particle of Photon inside of it, the clone particle will not be recorded into the stamp. This has been a larger problem for most people's lasers, which for some reason people save after the photons have been let into the clone grid (which erases most of the clone when saved.)
It's easy to get around this, you just make a stamp of clone when there are no photons inside but after they've been exposed to photons. >_>
...Otherwise I've noticed no delay in clone clone'ing speeds for photons. o.O