I recently updated my site to version 3.4.2 and we also did a complete theme change. The site was running perfectly for a number of days and suddenly every writer/editor/contributor on my site other than myself (admin) can't create a new post or access the Jetpack stats.
I created a test account under the "Author" role so that I could provide screenshots of the situation.
"Add New Post" Loading Screen: http://i.imgur.com/qBALF.png
Jetpack Loading Screen: http://i.imgur.com/ezlqe.png
Please provide any assistance or advice you have. Thanks