I am new to Vue as today was my first attempt, but I have the same issues you described. Sometimes it wouldn't paint and if I wanted to erase, it wouldn't erase. I found that I had to close and re-open Ecopaint for things to work somehow. I still have plants on tree tops as they wouldn't erase, not as a single item and not when I selected a bit of everything...That was highly frustrating as I have many other issues....So far, it isn't fun :-(