The ldd output shows where they are linked, note the two different directories depending on which Qt it was compiled against.

You see the 2009.1 and 2009.2, those are the two, 4.5.0 and 4.5.1 respectively.

From what I can see there are known issues with 4.5.1 that Nokia is going to fix so I think that pretty much sums it up. There was indeed a bug introduced.

Thanks for looking at this.

The solution for now is to simply build on 4.5.0 until another release comes out.