Android app not appearing in device market despite being compatible

I have an app (All operators' APN | Tweakker) and it's been on the market for a while now. I discovered this week that I can't find it from my device's market anymore although I used to be able to. Nothing in the app has changed. If I go to the web market I get a message that confirms the app is compatible with my Desir开发者_如何学Ce. I tried finding the app with other phones as well, even from different countries, and it just doesn't appear.

Here's what I tried so far:

• unpublish, publish
• change promotion preferences
• release a small bugfix update
• wait for the Market to return to normal

Someone suggested the single quote might be a problem, but that can't be the case since this worked up to this week. The app is using copy protection.

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The app seems to appear in the market now, although I haven't done anything more. I did contact Google, but I don't have an answer from them yet.