Hi melrine,
I just tried on my MAC safari 5.1 on demo page http://cutesoft.net/example/general.aspx, and can not reproduce this issue. Do you get the same problem on it?
And the paste issue, I tried on http://cutesoft.net/example/editor-onpaste.aspx, and it works fine for me too, can you try on it?
If the online demo works fine for you, please download the latest build and try again.
Latest build download url: http://cutesoft.net/downloads/folders/21904/download.aspx
Delete the old dll files from the bin folder and the "CuteSoft_Client" folder, then use the new one.
If you still get problem with the latest build, please send me your editor page url and the full steps to reproduce these issues, I will check it again.
Regards,
Ken