OS: Ubuntu 12.04 32 Bit
Pol: 4.0.18
When looking at the entries in Testing, Office, Game and any other, almost all entries are duplicated.
Here is an image to show the example:
As you can see all entries are duplicated. The only ones I could see not dupe were the first ones. The first 2 or 3, after that the dupe bug appears. This even includes the Patches and Testing sections.
Apart from this bug I would like to mention that from the Testing Section I have tested in 1.5.2 and 1.5.3 under Ubuntu the following games and they work out of the box (Not even using winetricks to install anything else):
Alice: Madness Returns
Prince of Persia: Warrior Within
I mention this 2 since they are in the testing Section and maybe me mentioning that they work in 1.5.3 with no problems (Even finished warrior withing and have 45% completed Alice. Very long game actually) could help in the development of the script.
I even did a talk in a university about Wine and PlayOnLinux and how they have contributed to the migration of users to the Linux world. In the talk I have an image of Both games working perfectly. In Alice you can even play the first game version (The one that appeared first, not madness returns) with no problems.
Hope this helps.