Upgraded today to v0.6 and downloaded blocks from start. When having a new wallet.dat everything works, but when I input old wallet.dat with coins in it, wallet crash one second after start (don’t have time to do anything before crashing).
Errors I receive (either first or 3rd image, then second image after clicking OK). BTW: wallet is fully sinced, up to date (at least when empty wallet.dat is imported)
you should dumpprivkey of all your addresses with positive balance using previous working version, import them into new version, transfer to new address and share the old wallet dat with developers for debugging.