Can't get MKMK adjustments to work

I’m trying to fix a particular combination of marks that occurs in Tai Dam language written in Lao script. In these cases, I want to move the maiEk down a bit.

Initially I had no script or language tags in my manual MKMK feature, and the GPOS adjustment wasn’t working, so I thought it worth trying putting language tags in there. But whichever way I tried with the tags, although the features compile ok, on export Glyphs gave me a double error:

With language BLT or LAO:

With language THA:

Please put your code in a lookup.

It doesn’t make any difference.

Can you send me the file?

Yep, will email, thanks :slight_smile: