Hi,
I use Coral Draw X5 on win 7 64-bit.
I have trouble working with transparencies inside a symbol. It also does not work if it is power-clipped inside a symbol. The error message is as follows:
This item cannot be stored inside a Symbol. The item must be removed in order to ba able to finish editig this symbol.
this same procedure works in Corel X4. very strange
I tried doing what you've mention, and I got the same error.
I think the solution is try to convert the object into bitmap before you make that in a symbol, But you can't edit the symbol anymore if you convert it into Bitmap. So I suggest make the necessary editing before you convert in Bitmap.