Myibidder suddenly stopped running. Nothing happens when I try to run it. I have tried several times to uninstall and re-install, including with REVO Uninstaller to get everything deleted. However, it does not show up in the list of installed programs and does not run. Any ideas?

I don't know what REVO uninstaller is and why that should fix the sniper.
Anyway, please reboot your PC after uninstall and then try to install it again after the reboot.