Build Helper

anyone else having trouble with the upgraded build helper now?

i use the helper, i clear it, i go back to building, i try to use it again and it no longer allows me the opportunity to select a target block. i can adjust the settings of the helper, but it stays locked onto the original block i used as its center. i can basically only use it once per entity now unless i completely re-log.

is this a bug or am i missing something?