Open Radar

 
Summary:
I have a properly setup 'Favorites' list in the Finder sidebar (see 1-finder.png). It shows correctly in 'Open/Save' dialogs when needed. Unfortunately, after some time of using the computer it breaks (see 2-open.png and 3-save.png), leaving only 'Devices', 'Shared', etc., thus rendering the sidebar useless.
I didn't manage to reproduce what exactly causes it to break.

Screenshots:
https://www.dropbox.com/s/opq3dwwa35qrqd9/1-finder.png?dl=0
https://www.dropbox.com/s/b8y8ofhv40xz249/2-open.png?dl=0
https://www.dropbox.com/s/cs51rb2eiy8nzqz/3-save.png?dl=0
https://www.dropbox.com/s/d2jz2i75h7nuus8/4-sidebar-ok.png?dl=0

Steps to Reproduce:
1. Start computer
2. Everything is fine, my sidebar works correctly both in Finder and the Open/Save dialogs (see 4-sidebar-ok.png).
3. After some time, 'Favorites' list disappears from the dialogs.
4. Restart computer
5. It's okay, but again, after some time, it breaks again.

Expected Results:
I expect the 'Favorites' list to appear as it should.

Actual Results:
The sidebar component breaks and 'Favorites' disappear.

Version:
OS X 10.11.2

Configuration:
This occurs on my MacBook Air (11-inch, Early 2015), 2.2 GHz Intel Core i7, 8 GB RAM