Now I can describe what is bad - it have transparent color when must be white color (for all pucture).

I'm work on computer (Win XIP SP2) with disabled themes.

I have themed screenshot of some program in png format without any arrows and file .object not created on disk for this screenshot.

1. I'm put arrow with text on this image.
2. I'm don't save it and select "Save As..." command
3. I'm save it as gif file and I get damaged gif file (attached as ...bad.gif).
4. After creation I'm press save button for this damaged file and now I have correct file.

Sometimes I can repeat such situation, sometimes can't

Also for Arrow object :)

Feature "Rounded corners" may be useful