Hmm, note for 0.3 we discovered an issue with the pubcenter control, hence the update. suggest you update to the latest version and re-test.
Yes if you don't update the ad position in orientation changed it wont draw in a visible portion of the screen (look ma it's over there)
Ensure you add references to all referenced providers such as PubCenter, AdDuplex and Smaato (except non-location version) as V1 required all libraries (something we are heading to resolve in V2)
P.S. the XNA version is still classed as a Beta but we have over 100 implementations noted so far (more with the Silverlight version). If you have a repeatable issue we'll be happy to look at it, but so far the Monster sample pack and the example
apps perform with no known issue