iOS Question:
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Suppose I get a “Blog returned invalid data” error message. What do I do?

Answer:

1. A common issue that can cause errors with the App is invalid characters. The easiest way to check is to go to the W3C Markup Validator and type in the URL of your WordPress site. If you get a response such as “… one or more bytes that I cannot interpret as UTF-8″ that is most likely what is causing the app to have trouble with your site.
2. You can also try with the default theme and with no active plug-in.
(Trying it with the default theme and plugins disabled will help pin down where the problem is. If everything works then you go back and enable your theme and then try it again. If everything still works then you go back and activate each plugin one at a time until you find the one that is causing the breakage.)

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