Just upgraded to Moodle 3.4 and am experiencing 2 issues:
1) My E-Mail Based Self Registration function is displaying blank pages - I've never made any updates or change to those pages, so it shouldn't be a customization issue. Running the "clean" theme which is supposedly fully supported by 3.4.
/login/index.php displays just fine - and the "Create an Account" button displays and functions. However - when clicking to "Create an account" - /login/signup.php? displays as a blank page. Have tried multiple browsers, devices, and have purged all caches.
2) The "Theme Selector" appears to drive a similar issue - /theme/index.php displays just fine - but clicking on the "change theme" button delivers a page with ?device=default&sesskey=AioMHnwsAd added - that is just blank - unable to select a new theme.
Can't help but think they are somehow related to a php error or something in common.