ListBox Items sometimes not visible on app Resume

Hey,
I have a winRT windowsphone 8.1 app in development and I've come across a strange problem sometimes.
Basically, when my app loads, I pull items from an RSS using syndication feed, store to a data set which is binded to the listbox. This works perfectly.
I can even hold the back button, terminate the app, then reload it and the items repopulate instantly (guessing the app automatically saves state? I didn't program this in) but occasionally, the listbox is empty. Or so I think, turns out the items are still
loaded; I tap the blank screen and an article shows up, I can still even scroll up and down this blank space, tap other blank areas and different articles from that feed load. So clearly the listbox is still populated, Just not visible.
Does anyone know what causes this? Any advice on what I need to be doing here? Can provide code if required.

Alright so I worked out part of the problem. The reason it wasnt working on navigating back sometimes is that parts of the code for initialising the listBox resided in the constructor, and not "onnavigatedto". Moving the code into that method fixed
the issue when navigating back pages.
However, the problem still remains on physically closing the app (swiping it away in multitask view). When the app is loaded again, the listbox is blank, but operable (the feed is clearly loaded as selecting the blank screen opens articles). It seems that
this doesnt occur if I change the "bypasscahceonretreive" property on the syndicatedfeed to "true", but if i set this that means the page will always bypasscache when navigated back to it, i dont want this (waste of quota) so i still need
to fix that one.
Im thinking i may need to implement proper resuming when the app is "closedbyuser"? So add an "onloaded" handler, and it the app was closed by user then just bypass the cache and itll probably work (again, not ideal, as id be happy for
it to use the cache).
Does this sound like the correct behaviour?
EDIT:
I had to do this. It worked, but wasnt ideal. So i bypassed cache on app first load and now it always shows up. weird.

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-238,21
+238,21 @@ public class WebServiceExchInteractor extends ExchangeInteractor
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+439,21 @@ public class WebServiceExchInteractor extends ExchangeInteractor
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