The rule based prover (0.2.0) allows me to create a theory with the name of an existing context (maybe also machine).
The proof obligations of the context are then exactly the proof obligations of the theory.
It seems that the .bpr file of the theory overwrites / hides the .bpr file of the context.
The issue is related to the rule-based prover plug-in.
This does not happen on Windows platform. What system are you using?
I use Linux.
The rule-based prover will be part of the theory plug-in that also defines the mathematical extensions. This problem should not appear in the release of Theory plug-in.