Very strange – I’m running WPBook lite on a 4.0 blog and was on a 3.9.2 blog as well.
Is it possible there was some interaction with another plugin or some aspect of the theme, since this isn’t happening in any of my test blogs?
I am having the same issue. I deactivating every other plugin and the blank screen was still there. Any idea why this would be?
No, I really don’t have any idea – do you have access to the PHP Error log for the site in question?
You say it’s only blank pages after logging in to the site, but not for public users?
Have you tried deleting all the WPBook Lite files and reinstalling?
I just tried deleting and re-installing WPBook Lite and it did not resolve the issue. The blank screen is still there.
Can you tell me what error is thrown in the PHP logs?
Above you mentioned “this plugin was creating the famous cannot modify header/cookies error” – do you have the specific text of the error you are referring to?
Are you using a default theme? Is it possible there is some theme interaction going on?
Sorry you’re experiencing the problem but I’m not – perhaps has to do with the fact that all of my test blogs already have existing Facebook apps and settings – could be some kind of error in the logic triggered when those don’t exist.
I’ll test on a vanilla new 4.0 install and see if I can find anything – but really the best help would be the output from your blog’s PHP error log.
[10-Sep-2014 15:46:17 UTC] PHP Warning: Cannot modify header information – headers already sent by (output started at /xxxxxxx/xxxxxx/wp-content/plugins/wpbook-lite/wpbook-lite.php:1) in /xxxxxxx/xxxxxx/wp-includes/pluggable.php on line 1173
Ok, looks like somehow the encoding on the wpbook-lite file got set to UTF-8 with a BOM. Setting back to UTF-8 without BOM seems to have solved it on my local install.
Check out 1.6.2 I just tagged in the repo.
That said, even this note is just a Warning in PHP – doesn’t explain why you are getting blank pages in the admin which I can’t reproduce.
