Before the spike incident, before 10 hours ago, because NENG had multiple reset almost every day, your 24 CPU solo mining on NENG probably get very little because CPU miners do not get anything on reset, or may be some blocks, but almost nothing.
About 10 hours ago, a spike was mined. After that, your CPU miners on 24 instances should get tons of blocks mined on CPU cheetah_cpuminer software. But make sure the wallet is well synced on this. Currently almost all blocks are mined by CPU miners, either in windows, linux, mac, chrombooks, or android phones.
as i have stated.. im am mining with multiple cpu's and asics and gpus to test your "spike" and all i am seeing is that when a spike happens.. No method gets blocks.. im willing to bet the only wallet that does get blocks after the spike is yours.