This support ticket is created 4 years, 4 months ago. There's a good chance that you are reading advice that it now obsolete.
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We had a View filter that we haven't altered in months, and it was working perfectly until the last Toolset update.
It had a group of radio buttons in the filter that now produces no html. In the attached pics, you can see what the filter looks look (bottom right, near "Sort by") and the empty html being produced.
I just tested this locally and can confirm the same, namely that front-end sorting controls displayed as radio buttons are not output on the page.
This happens after upgrading to Views 3.x.
I deleted the shortcodes to insert the controls and re-inserted them as a select dropdown, and that appeared to work.
I'm escalating this so that it can be fixed by the developers, but in the meantime you can either downgrade to Views 2.9.4 (available from toolset.com/account/downloads), or switch to using a select dropdown for the sorting controls.
Thanks Nigel! For a minute yesterday I thought I was crazy and it had to be something wrong in my view html. I’ll switch to a drop down for now and keep an eye out for a fix in a future update.