This used to work on my site:
<Loop taxonomy=post_tag terms="zx80,microace,zx81,ts1000,ts1500,ts2000,ts2048,ts2068,tc2068,zx-spectrum,ql,z88,downloadable">
<button class="btn arttagbutton" onclick="filterSelection('comp{Field name}')"> <Field title /></button>
</Loop>
The output would look like this:
<button class="btn arttagbutton" onclick="filterSelection('compzx80')"> ZX80</button>
Now I get:
<button class="btn arttagbutton" onclick="filterSelection('comp{Field name}')"> ZX80</button>
Honestly, I can’t tell you when it last worked but it did work once upon a time
David