First of all, thank you for being one of those people who takes the time to research an issue then share your findings with the community. I can’t tell you how much I appreciate that. This is really good advice and I am sure our tech support department appreciates the assist as well. 😉
Second, it looks like you are using Premiere Pro CS6 or earlier. Another option would be to upgrade to Premiere Pro CC. I spent a lot of time working with our developers on the issue of regenerating PEK files and I feel pretty confident you will find the experience to be much improved.
Tom Nord
Quality Engineer
Adobe Media Encoder