There seems to be bit of lockscreen bug with the latest nightly versions of pac rom for nexus 5(atleast for me,don't know about others)
This bug was not present till the rom released on 30th March 2014 .I am posting a screenshot for your convenience.
Rom-Pac Rom nightlies 18th April 2014
Kernel-Elemental X 0.36cm
Sent from my Nexus 5 using XDA Premium 4 mobile app