I have now upgraded 4 sites with WordPress 3.5. Every single one of them have viewed totally blank and I've had to delete the WordPress files and re upload them manually.
I've made sure that plugins are updated and I've made sure the sites are backed up. I don't understand why the upgrade has done the same thing to each site I've done so far.
I'm dreading doing any more. I have over 20 more sites to upgrade and really don't want to be doing any more manual updates. It's extremely time wasting and for most of these sites it's not like I can charge someone for my time.
Think I'll hold off doing any further upgrades till I know that it's working properly.
The themes I'm using are varied, some paid for, some not.