Problem adding files to deployment project

For some time now I have had problems adding files to the file system editor portion of a deployment project.

When I right clicked, add file, browse for a file, any file (dll / jpg / xml / txt / ...)
It would not add this file to the project,

Luckily there are workarounds for this issue (no definite fix found yet) :
- the simplest is just closing and reopening visual studio
- Rebooting your pc may also work
- Adding a shortcut to the file (which will add the file also), and deleting the shortcut (I have not tried this yet myself)
- Resetting your visual studio settings can also help (also haven't tried this myself)
- Some even say that reinstalling fixes this problem (which will ofcourse open & close visual studio and reset the settings ;-) )