Hi,
1) I just check it and the log is disable. The TMP direcoty exist on root (rights 755), and I add new one to Web directory due WP is installed in a folder (child folder). The error still appears.
2) Each plugin (Events Calendar, EC Pro and Tickets) has their own lang directory. This .mo and .po are correct. In WP/Content/Languague I do to things:
a) Delete events_calendar_es-ES (po & mo)
b) Replace both with the correct spanish version.
But always happens the same, the old files are installed again from WordPress Updates. I don´t use BuddyPress.