sometimes when i edit sprite and use tools to draw lines etc my image dissappear!
This is not enough information to do anything about, please see how to report bugs. Can you reproduce any particular sequence of steps that causes the image to disappear?
I have had this happen in the past as well, but could not get it to repeat. So, I am also watching for clues. (I have a feeling it's related to Undo, but that is a far reaching hunch right now.)
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1. Open a sprite in image editor.
2. Select the line tool.
3. Single click anywhere on the image. (single click, don't draw a line)
4. Use CTRL + mouse wheel to zoom.
5. Image disappears.
Ramones found it! I was able to repeat it using those steps.
Thanks ramones - great find on the repro there. Should be fixed in the next build!