XF 2.1 bbcode img not working as intended?

[Martyn]

seems for some reason my forum has stopped displaying this code

[URL='http://grabilla.com/09819-00af9e9f-0ac6-4bb5-8ba4-826f164bade5.html'][IMG]http://grabilla.com/09819-00af9e9f-0ac6-4bb5-8ba4-826f164bade5.png[/IMG][/URL]

a user trys to post this and just gets a nothing, a blank area.

the html code is ther, but it just doesn't display anything

<a href="http://grabilla.com/09819-00af9e9f-0ac6-4bb5-8ba4-826f164bade5.html" target="_blank" class="link link--external" rel="noopener"><img src="http://grabilla.com/09819-00af9e9f-0ac6-4bb5-8ba4-826f164bade5.png" data-url="http://grabilla.com/09819-00af9e9f-0ac6-4bb5-8ba4-826f164bade5.png" class="bbImage " style="" alt="" title=""></a>

just tested it on here in the test forums and it works fine? anything to check?

cheers