Not sure if why this is happening. May be from the new jailbreak, cydia servers may be bogged down. Flash either times out and closes, errors with install failed or just hangs on installing and never installs.
Anyone else getting this
So I decided to manually install NitoTV and noticed that the downloads of packages are slow or timeout. After a few attempts i was able to install NitoTV. Then install maintenance via NitoTV. It took a while but I guess if I wait for the bottleneck to open later tonight, atv flash will again install normally.