We lost power at my house yesterday (4/25/24) unexpectedly, which shut off my computer. I can no longer start any new statblocks. No issues with the statblocks prior to this unexpected shutdown. I've tried going to them from the dashboard (both Feats and Player Characters), as well as accessing an existing statblock, hitting save, then the new of same type button that appears. I've restarted my computer, logged in and out of my account, and deleted several history entries.
Dashboard -> D&D 5e Statblocks -> select any statblock -> 404 error. Open statblocks from side menu -> open a statblock -> save -> "Create another (statblock)" button -> 404 error.
We are working on a fix for this, if you want to stay updated about the progress go to the original bug and upvote it!