Why did mine fail?
Pick the symptom. Each answer comes straight from the converter rule base — and filing testimony about your bake is what sharpens the next answer.
Gummy texture Fell apart / crumbly Dense / heavy Dry Sank in the middle Bland Spread too much Gritty
Gummy texture
The classic double-gum error or an underbake. If your blend already contains xanthan or guar, never add more — that is the most-cited cause. Bake cakes to the long end of the range (3–4 minutes past a clean tester, 210°F internal). Let bakes cool fully before judging: GF crumb sets as it cools.
Run your recipe through the converter — it applies these rules automatically.