Just like that and out of nowhere. Since this afternoon I simply can't open it when TotalFinder is running.
Most of the times, trying to open Trash from the dock results in no action whatsoever. Some other times I'm luckier and it produces a weird-looking Trash window that I can't interact with nor close. I've tried relaunching TotalFinder and rebooting the OS and it's still the same.
A screenshot of the weird-looking window here:
The only thing I'm yet to try is reinstalling TotalFinder, but since this seems a very weird bug, I'm willing to stay like this a bit longer if my logs can help figuring out what the problem is.