Well, they sure break their game a whole lot. This is the third different game-breaking problem this week alone, though from the lack of Internet chatter about this, I'm not sure if it's broken for everyone (as was the case twice earlier this week) or if it's just me.
Normally when I try to launch Tree of Savior, there's a window briefly to acknowledge that it's launching, then it goes away and looks like it did nothing for a minute or so, then the game window opens.
I played for a while earlier this evening. When I tried to play again, the game locked up my computer at the title screen. I hadn't previously seen that happen at the title screen, but it wasn't that surprising, as Tree of Savior alone accounts for most of the crashes that this 7+ year old computer has seen.
So I reboot the computer and try to launch the game again, and there's a giant patch to download. Who patches a game on a Friday night, anyway? I read stuff in a browser for a while, and about ten minutes later, the patch is long done, but the game didn't launch. Try launching the game and watch Task Manager and the game starts to load as normal (while displaying nothing on the screen), then abruptly closes and frees all of the memory it had allocated, before the game visibly launched. No crash error message or anything, but just the program vanishes.
Reboot the computer and try again. Makes no difference. Uninstall the game and do a complete reinstall. Makes no difference. Reboot after the reinstall. Still no difference.
And this, of course, from a game that doesn't have tech support. Steam does list an e-mail for tech support, but I e-mailed them about a problem three weeks ago and still haven't gotten a reply.