Tracked it down to Lightning causing the problem.
Also Daily won't open the profile manager if I just use ~/Applications/thunderbird/thunderbird -p as the Command in the launcher. Both the release and beta versions do open the profile manager using their designated commands.
Starting Daily from a terminal gives me
Code: Select all
(process:3342): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
Error: argument -p requires a profile name