I have a Python 2.7 & a 2.7 based virtual env. Both are up to date.
I install numpy using the numpy-1.6.2-win32-superpack-python2.7.exe
After that, both 2.7 and virtual env DB need refresh.
I click refresh on the virtual env.
Both are making progress, I wait for it to finish.
When done, 2.7 DB is up to date, but virtual env DB still says it needs refresh (see screenshot).
I hit refresh on virtual env and it immediately changes to up to date.