Tera folder : Tera/
delete file Live-Launcher-D3.6.version
This helped to me.
this somewhy works on another problem i got with patch 80 with the .exe becoming "not responding" and taking ages to launch while using constant 100% hdd and the whole system hangs and freezes at times, eventually when it launched it was very unstable with loading times through the roof i thought it was some engine setting files leftover from classic causing conflicts but completely deleting the game and redownloading didnt fix this, everything worked fine in classic server and on live servers pre 80 patch, id post the event log but both the console and the txt it writes to refresh everytime the launcher closes, but on the console i saw it promt some corrupt files but didnt see what else was going on with it since it whizzed past so fast and closed along with the launcher. could be my hdd but not so sure since redownloading should place the files in sectors that arent bad.
This basically just alleviates the symptoms but doesnt cure, deleted the game again and this time just got the steam version, same problem with this one aswell but thistime deleting the file doesnt prompt a patch but instead leaves the launcher without a patch bar and a Play button and only way to continue is to do a steam file check that takes as long as the launcher one or place the file back. Note NA version that is pre patch 80 works fine aswell as the EU version that was pre 80