Shelbyw7

I opened Pixillion this morning, and was advised that there was an update. I downloaded the update and installed it. Now when I go to the apps folder and click on Pixillion, I get the icon for a second in the bottom toolbar, but then it is gone. Then all I get is the icon flashing in the toolbar, and a window opens asking for me to report a problem. I have had up to 4 flashing icons in the toolbar....The only way to get rid of them is to send that there is a problem. What is going on? I am using an iMac Big Sur version 11.6.