This effect is created by displaying a view of captured area inside of the same area being captured. Its similar to standing between two mirrors; each image repeats the other. To fix this, you can:

• minimize the capture display,
• move it to a different part of your screen, or
• close it. If you do, Visimeet will ask you if you want to stop transmitting the video. Answering "No" will close the window but continue sending your desktop to others.