I dont use offline installer, so this may not be relevant. Whenever henkaku wont load for me, i close the browser, reload the site and try again. If it keeps looping on loading, like half the bar loads and then it starts over ad nauseum, then i close the browser, turn the vita off and restart. I have never had to clear cookies, delete history, rebuild database etc. I only ever have that one tab or page open the entire time i am trying to load henkaku. Also might help to go back to the main henkaku page before closing the browser. I found that if you dont and it was looping, it will go right back to looping when you open the browser. You really should only have to power off and restart if you get an error though. I got r5 pretty much as soon as it released, but seems this one took a lot longer to trigger properly than the other versions did.