I've been purchasing tickets for a year and now my wallet will not fully sync the blockchain...stuck on 342913.
Same. It thinks 00000000000000000a2d564bbe2ecf3fb982d19bb528db0302d903293b99ed33 342914 is invalid. Probably it would work if we re-verified the blockchain I guess. I've upgraded from 1.3.0 to 1.4.0 but it still thinks that block is invalid, need to find out how to tell it to forget it thinks that.