I’ve tested this on Vanilla mIRC and confirmed the results.

If the user presses the RETURN key with a custom window active, mIRC will produce a windows “beep”. It does this with sounds off, it even does it with picture windows. This is incredibly annoying. My script catches the “Enter” key and uses it as a function for the script. However, every time a user presses enter, it generates a beep.

There does not appear to be a fix, and this bug did not appear in previous versions to 6.xx to my knowledge.

TO REPRODUCE:

Enter the following command:
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/window –p @test
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-> This should produce a custom picture window WITHOUT an edit box, which may produce a beep with no text entered
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Press “Enter”/”Return”
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-> This should produce the annoying unstoppable beep.

There is no editbox, but it beeps anyway!

I've also sent this bug to khaled

i think thats actually windows telling u there isnt anything to enter on ...... if u have mirc completely off and press enter u might still get this beep ... or atleast should

This is not a bug, it's a Windows feature. If you don't want that beep, download Tweak UI, install it, then under the 'General' tab' of Tweak UI, uncheck 'Beep on errors'. That should take care of your problem.