Repercussions are being felt in the ethereum development ecosystem after an initial test of the platform's forthcoming software upgrade, Constantinople, failed to deliver expected results.

A system-wide change initially earmarked to go live in 2018, the code release, meant to introduce five improvements and alter the economics of the $20 billion blockchain, may now be delayed following a failure of Saturday's activation on the test network Ropsten, developers told CoinDesk on Monday.

After a meeting of ethereum's open-source developer team last Friday, in which it was suggested that Constantinople could be implemented as early as November, Saturday's failed activation revealed unexpected issues in the code. Namely, a bug was discovered by security lead for the Ethereum Foundation Martin Holst Swende, one which caused two different iterations of the same software upgrade to run on testnet.

https://www.coindesk.com/ethereums-next-blockchain-upgrade-faces-delay-after-testing-failure/