In wordpress, when adding a new page or post, a CiviCRM button is available to add content from Civi. The "Insert CiviCRM Content" dialog box opens as expected, but the select box doesn't allow a selection. The select box contains "User Dashboard", "Profile", "Contribution Page" and "Event Page", but these options open underneath the dialog box and can't be clicked.
Turns out that this is because the select box has a z-index of 399,999. I can't find any CSS conflict that would cause this, and there is no JS error in the console. Any suggestions would be appreciated.