I've been using it a lot without any problem.
Can you please post or PM the URLs that causes it to crash? If you are unwilling to do it, you can always go to
www.applian.com and submit a support ticket (unless you use a cracked version).
Do you use any other stream recording software or any software that uses WinPCap simultaneously with
Replay Media Catcher?
What version of Replay Media Catcher and web stream dumper plug-in do you use?