The problem occurs when you have set a strong
security level in your browser. Since the command is in a loop you cannot
close this alert, you have to kill the whole browser window or continue
replying to the prompt.
To keep this message from appearing the Security
Setting needs to be modified:
Specifically we are talking about this setting in
IE6 and IE7: Tools > Internet Options > Security ("Internet"
selected) Then use "Custom Security" levels and find the following
option: "Allow Paste Options Via Scripts"
or "Allow Programmatic clipboard
access"
Set to "Enable".
If that is set to "Prompt" the browser will pop up an alert
message for each frame asking:
IE6 - "Do you want to allow this page to paste
information from your clipboard?" <YES> <NO>
IE7 - "Do you want to allow this webpage to access
your Clipboard?" <Allow> <Don't Allow>
This should solve your problem.