Flash Builder 4.5 messing up my released iPad app

Using Burrito and coding exclusively in AS3 (no Flex), I built and released an iPad app in the App Store.  When I recompile that code using Flash Builder 4.5, I encounter a number of problems:

- at first the size of my app appears about 50% its usual size, and is slightly off the screen in both the x and y directions.  Once I rotate the iPad, everything restores to normal.

- text is sporadically resizing down.  Elements that are created usiung the same method and have explicit font sizes, sometimes appear about 50% their normal size.  This may be related to the previous problem because I feel like it only happens in the beginning, and as new text comes onto the screen it is consistently the correct size.  But it is strange that some elements are small and others are big.

I would like to make updates to my released app, but I cannot because of these issues.  I seem to be using AIR 2.6.

Anyone have any suggestions how to fix these problems?

Thanks,

Adrian