This problem most frequently occurs when using WebViews, because depending on the particular page being loaded by a WebView; there may be a very large number of elements for the Repl() tool to attempt to query. In theory, it can occur on other types of views as well.

The general workaround for this scenario is to identify the main view or parent element you need more information on, and target that using AppQuery to list the details of the view's child elements. 

For example:
>> app.Query(c => c.WebView()); // for a webview
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If the Repl() is still unresponsive or displays too many elements, you can narrow the query through the use of either index values or targeting a different parent element.
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>> app.Query(c => c.WebView().Index(0));
>> app.Query(c => c.SomeOtherView());