For some reason I am suddenly unable to insert a quote. I have just switched to Google Chrome. Is there a connection?
There is a bug in the forum software - if you try to insert a quote using Chrome without the cursor in the editor window it fails.
Please can you try clicking in the editor first, then clicking the 'Insert Quote' link?
There is a fix for this, but it looks like it breaks another aspect of the editor, so I need to do some digging.