So I got one of the new artifacts and decided to drop the TC sin stones I had been getting with the new TC. I open up the UI, put the Lazarus artifact in, drop an entire stack of green sin stones. I think it was around 4400 or so XP. On other breakthroughs, any extra XP carried over a breakthrough, so I didn't bother breaking them up into stacks. So far so good. It says ready for breakthrough, but I forgot my catalysts in my bank. I close out the UI, go grab the catalysts, then open up the artifact UI. Now it tells me that I'm not even at level 19 any more. So now I'm out a good chunk of real money sin stones and my artifact isn't even ready to go. I've tried relogging to no effect. I put in a ticket, but I'm told that since it's a bug, the CS team can't intervene directly and replace my stones. I guess this is a warning to other people...you need to handhold the artifact UI.