Gasp not exporting default

Glyphs Version 2.4.2 (1017) / OSX 10.10.4

When I export to TTF I expect the GASP table to be exported with default values. It is empty when I export without autohinting.
If I add the default values (8px/20px on custom parameters) it exports the gasp table empty.
If I add different values manually (on custom parameters), the table is created accordingly.

I discovered this because the rendering on the testing page was super bad on Windows/Chrome and it was ok with fonts exported from other Mac/Glyphs.

I don’t know if I’m doing any mistake.

The GSASP table is only exported if you have any TT instructions in your file. it is not useful otherwise.

At some point I had a horrible rendering of my ttf fonts (against others generated in a different computer) and I didn’t know why. But when I created the GASP values manually and this problem was solved.
Now I don’t have that problem anymore and I can’t reproduce it. I will let you know if I see it again.