I applied this patch in production and had to revert the upgrade because Vibe would no longer function.
Redoing this same work in the lab shows the following in the "installer.log":

encryption key change required for this v3 or v4 upgrade....
...generating a new encryption key....
generating a random encryption.key.
encryption.key changed from...... to .....

Can anyone confirm if this is part of my problem? Or is this normal?
If it is the problem, do you have a solution?

It's Vibe running on a Windows 2008R2 server.
JDK is presently at 1.8.0_60 but I upgraded to JDK 1.8.0_152 in lab then tried upgrading again and the same problem occurs.