Admin Dashboard bug: dashboard reset and/or won’t load completely

Good day all,

Without reason, my administrative Dashboard in WordPress has seemed to either reset, or at the very least fails to completely load. Here is an image:

https://img153.imageshack.us/img153/7614/dashboarddaveursillocom.png

Notice how the Categories on the left are all collapsed: when I click another admin category, they expand back to the layout that I normally have them (some collapsed, some open), so it seems that the problem is just with the main Dashboard display.

I tried installing a fresh copy of WordPress and the problem remains.