Furry stuff, oekaki stuff, and other stuff.
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I'm afraid undo has always been buggy in the Shi-chan applets. I didn't write the applets, and the original author hasn't updated them in a long time, so it's not likely to be fixed.
Drawing with animation support turned off seems to help, as does using the latest version of Java.
Sorry for the double thread, but I had another query.
Sometimes I on my oekaki find that when I press the 'Undo' button on ShiPainter it seems to undo a lot of work and sometimes make a layer (different from the one I am working on) disappear. Pressing redo repeatedly does nothing. Sometimes pressing undo repeatedly brings a little bit of the recent work back, but not all and can leave the other layer completely blank (if it clears one).
Why is that? Is there anything I can do? I have experienced this error in IE, Firefox and AOL.