Microsoft Community forum moderator Basith M posted an update to the original thread discussing the issue, writing:
With the help of users and MVP’s who posted on this thread an investigation determined that a small fraction of users who had moved app information to a second logical drive could encounter this issue.
The Windows Update released on August 31st for Windows 10 includes a fix for this issue. This update is automatically applied when installing the Anniversary Update.
Despite the fact that freezing should [hopefully] now be resolved for everyone that installed the Anniversary Update, Microsoft still hasn’t explained what exactly was causing the problem in the first place.
We initially became aware of the freezing problem shortly after the launch of the Windows 10 Anniversary Update, with reddit user SoloWingX bringing quite a bit of attention to issue. “After logging in everything works for like 20 seconds,” wrote SoloWingX in early August. “After that if I only mouse over the Start area, Taskbar, the black part simply, it freezes and I get a message that Windows is not responding."
Other users chimed in that they were expecting similar issues. Microsoft would later confirm the problem, but said that it has received only a “small number of reports of Windows 10 freezing” during its initial investigation.
While Microsoft worked internally on a solution to the problem, the company had encouraged users to seek guidance from other community members on possible ways to mitigate the issue.