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I've just added a very simple UIWebView based embedded browser into our app. This loads and navigates pages fine, but as soon as I rotate the device the entire UI stops responding. It is, however, still running and I can pause the app, and print a backtrace: (gdb) bt #0 0x00f35bd4 in -[CALayer addAnimation:forKey:] () #1 0x00f283e3 in endChange () #2 0x00f2a535 in CALayerSetBounds () #3 0x00f2a2b6 in -[CALayer setBounds:] () #4 0x00573307 in -[UIView(Geometry) setFrame:] () #5 0x006c1a3a in -[UIWebDocumentView setFrame:] () #6 0x008aad59 in -[UIWebBrowserView setFrame:] () #7 0x006c1277 in -[UIWebDocumentView _updateSize] () #8 0x002a76c1 in _nsnote_callback () #9 0x019d4f99 in __CFXNotificationPost_old () #10 0x0195433a in _CFXNotificationPostNotification () #11 0x0029d266 in -[NSNotificationCenter postNotificationName:object:userInfo:] () #12 0x0196d67d in __invoking___ () #13 0x0196d551 in -[NSInvocation invoke] () #14 0x027db82a in SendDelegateMessage () #15 0x027ba138 in WKViewSetBoundsSize () #16 0x02825628 in WebCore::ScrollView::platformSetContentsSize () #17 0x0282552b in WebCore::ScrollView::setContentsSize () #18 0x027d8ccc in WebCore::FrameView::setContentsSize () #19 0x027e8b27 in WebCore::FrameView::adjustViewSize () #20 0x027c68a4 in WebCore::FrameView::layout () #21 0x027dd1e0 in WebCore::Document::updateLayout () #22 0x027dd0fe in WebCore::Document::updateLayoutIgnorePendingStylesheets () #23 0x0285bc7b in WebCore::CSSComputedStyleDeclaration::getPropertyCSSValue () #24 0x0285a768 in WebCore::CSSComputedStyleDeclaration::getPropertyCSSValue () #25 0x02910963 in WebCore::CSSStyleDeclaration::getPropertyCSSValue () #26 0x0291017b in WebCore::JSCSSStyleDeclaration::nameGetter () #27 0x02053d1f in JSC::JSValue::get () I sometimes, but not always, also get this in the console: void SendDelegateMessage(NSInvocation*): delegate (<CFNotificationCenter 0x5e199c0 [0x1a6a3e0]>) failed to re

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