@Mark W. Mathers: Sorry you're having trouble. Blog comments are a good way to provide feedback, but they can't replace the Support function. Support engineers can collect information about your environment, help you troubleshoot an issue and provide a resolution, escalate issues as required.
There have been a few comments here, which do alert the product team and Support, and prompt an investigation, but given the installed base and wide variety of environments Exchange is installed in, it's not always possible to determine root causes without getting more details.
If we knew for sure that every RU5 v2 installation produces a blank OWA page, you would already read about it here on EHLO and the RU would likely be removed - it does not matter how many versions of RU we already released.