Problem since changing text editor

I changed the text editor plugin for the blog from markitup to tinymce and here is the relevant part of the template:

<div class="description entry-content">
    <perch:blog id="postDescHTML" type="textarea" label="Post" order="2" editor="tinymce" html="true" size="xxl autowidth" required="true" />
</div>

The new editor appears fine in the admin, but post content is just showing as one huge block of text, like this:

h2. Want to crowdfund for your project, organisation or cause but don't understand the crowd, the funding or the tech? Fear no more - "Peoples Republic":https://www.peoplesrepublic.co and "Hubbub":https://www.hubbub.net are teaming up at "Social Enterprise Conference 2015":https://www.socialenterpriseconference.info/ to give you an opportunity to come and learn how to make crowdfunding work for you. When: Monday 12th October, 6pm- 8:30pm Where: Coin Street, London In this highly interactive evening workshop, "Esther Foreman":https://uk.linkedin.com/in/estherforeman from "People's Republic":https://www.peoplesrepublic.co, and "Jonathan May":https://uk.linkedin.com/in/changetheworld from "Hubbub":https://www.hubbub.net will cover the essential steps to resource raising for social change including; * Steps to planning your crowdfunding campaign * When is the best to launch a crowdfunding campaign * Building a crowd * Keeping momentum * Evaluating your crowdfunding campaign * What happens next As part of our partnership with Social Enterprise Conference 2015, we are able to offer you a 'friends and family' 100% discount on the workshop and 10% off the conference. Please email esther@peoplesrepublic.co or follow @republicpeoples for the secret booking code #welovecrowdfunding

have I missed something?