The topic is locked ok, but the "Topic Locked" popup with Ok button does not appear so the screen stays greyed out.

Of course pressing Esc does the trick too in this case since the operative action has been completed,

Since the basic function (Lock Topic) is performed, I consider it a cosmetic error that can be fixed when time allows.

Did the popup work in other places, or did it work in other places?

Are any JS Errors thrown. I see the modified ColorGrey.js file you use is throws an error because its not correctly formatted.

If there is a format error, I'd be happy to know how to correct it.

It seems like it is the "action notifications" that don't work fully ok for me.

Had a report about a "message flood notification" the other day that just made the screen go grey with no popup to press.

PM notifications work ok, but in some places non-existing popup boxes just grey out the screen.

Simply remove the whole js file, remove the Header Tag if you dont want to use the rounded avatar Feature

<Resource tag="HEADER">
	&lt;script type="text/javascript" src="~/js/jquery.tipTip.minified.js"&gt;&lt;/script&gt;
	&lt;script type="text/javascript" src="~/js/ColorGrey.js"&gt;&lt;/script&gt;
	</Resource>

Is this Browser Specific?

You need to download the updated js files from the repository

http://yafnet.codeplex.com/SourceControl/changeset/changes/63189fd15e47 

Well done, and thanks for fixing the issue... 👍

However, the "flood message" says "You can\'t post..." - just a minor cosmetic issue, but at least it shows up now and does not only produce grey mist on the screen... 😄 👍

Fixed in latest change set