Hi Eoin
First off, if I save and close the Form & Content Type, then open it again, the custom attributes checkbox is unchecked, but the data is still there ie I can see the data again when I check the checkbox.
In the 1st of the 6 boxes within the Custom Attributes section I put: data-options.
In the first of the 6 boxes within each option of my select list, I put My Option 1, My Option 2, My Option 3 for the 1, 2, and 3rd option.
And the front end worked:
My select list is:
<select id="select_me" name="select_me" class="inputbox select">
<option value="" data-options="" selected="selected">- Select an Option -</option>
<option value="opt1" data-options="My Option 1">Option 1</option>
<option value="opt2" data-options="My Option 2">Option 2</option>
<option value="opt3" data-options="My Option 3">Option 3</option>
</select>
So maybe it is a cache thing, have you tried it on a fresh install, do you get the same result?
Bucklash