[tde-users] [openSUSE] can't login to sole user

I just did an openSUSE Leap 16 installation on a new used PC with FM2+ AMD. Only IceWM was installed initially, then TDE, then Plasma. TDM is active DM. Plasma and IceWM sessions work normally, but for TDE for the only user, instead a popup:

Call to lnusertemp failed (temporary directories full?). Check your installation.

/tmp is on /, so plenty of freespace. I don't know of any other tmp directory(s). Root TDE session works fine. This is my first use of SELinux. Could it be related? If not, what would? I see no suspects in dmesg or journal.