sticking point 
noun
An obstacle to progress towards an agreement or goal: safety issues have been a sticking point in the negotiations...
- The prisoners have become a major sticking point to progress on the US-backed road map peace plan.
- It affords a temporary sticking point in the forward progress of evolution…
- Start the advanced routine only when you hit a sticking point in your general progress.
- declamatory
- declarable
- declarant
- declaration
- Declaration of Independence
- Declaration of Indulgence
- Declaration of Rights
- declaration of the poll
- declarative
- declaratively
- declarative memory
- declarator
- declaratory
- declare
- declare an (or one's) interest
- declared
- declaredly
- declarer
- declass
- declassification
- declassify
- declaw
- declension
- declensional
- de Clerambault's syndrome