Had a customer send me their logo to put on tshirt. I cleaned up the graphic and changed into a pdf so that could create the transfer in my Icolor500 machine. The logo looked great. However when tried to print the transfer the graphic had very thin black lines in 3 places on the transfer. They did not show on the screen in corel draw. So I went back into corel draw and created a color box-copy-pasted and moved over into the box to see if they showed and they did as long as I was moving the graphic but then were invisible again when landed it in the colored box. I'm not a graphic designer so I don't know how to erase them when they are virtually invisible on the computer screen but show up on the image print transfer. Can anyone help?
Sometimes Wireframe view can help you see things like that.
You can also use the Object Manager ("Objects" in CorelDRAW 2019) docker to see what objects are present in document pages and layers.