Rotate/invert functions DO work, just differently, before you would hit the combination first, now, you must have the stamp open with the 'preview' of it up, then you can ctrl-r and ctrl-shift-r to rotate it. You can now ctrl-arrowkeys to shift the stamp pixel by pixel.
Edit: 'Powder.exe has encountered a problem and needs to close' After a horizontal flip. That was on a small-ish stamp, and it crashed. It even does it on tiny stamps.
@JeremyF When you first load a stamp, you will get a faded 'preview' of it, that is what I'm talking about. At then point you can then use ctrl-r and such
like the new version. portals look more like something out of the Portal games- still awsome. and for water- you need to mix H2 and O2 then burn it. the fire will turn into steam.