What do I need to do to fix this issue? Looks like both of my clients are now mining orphaned blocks. Both are v3.0.0 and were mining fine until last week, my last valid blocks according to the block explorer were on 06/06/2017.
I restarted with -zapwallettxes=1 but that does not look like it did the trick. Do I delete everything except my wallet.dat, reinstall, and run again? Or is there something else that needs to be done?
Yes, that should do it - use the -zapwallettxes=1 too
Thanks! Still waiting for one client to catch up, but that seems to have done it. The orphans are gone at least.