There seems to be a problem with Avant's built in Download Manager. Recently I've noticed that the Download Manager will stop working if I click on a download link then hit 'cancel' rather than 'OK' to download the file. What's more, other download managers don't pick up the slack when this happens, which means that when I click on a download link after such events, nothing will happen. The only way to fix this seems to be restarting the browser. It's nothing major, but it is a minor annoyance.
Avant Browser Ultimate Version 171 (I almost always run in Chrome rendering mode)
Windows 7 Ultimate 64-bit
8 GB RAM
Feel free to ask for more information if needed...