To reproduce:
1) Have 5.0.0b2 and any other 5.0 version installed
2) Make a new project in b2(let's call it Project 1).
3) Open b2 project wizard, notice that Project 1 is in recent projects
4) Open any other 5.0 version's project wizard, notice that recent projects list is empty.
5) Create a project in there(let's say, Project 2)
6) Open project wizard in non-b2 version - it lists Project 2 in there(but not Project 1)
7) Open project wizard in b2 - it lists the same projects as a non-b2 version(meaning that only Project 2 remained in it and Project 1 disappeard from it)

If you again create a project in b2, the recent projects list in other 5.0 versions deletes out again