NEW ISSUE WITH 0.5.907 - I have found that if you create a clip like <span class="italic">\1</span> then highlight some text containing brackets the clip will not be inserted. The text remains highlighted, but the span is not inserted. This seems to hold for any clip with a \1 component. I hope I'm not reporting a known issue as I searched, but found nothing like it.
Kubuntu 12.10 system.