Display History option

Still cannot reproduce.
Moreover, all code is server side, so should not be browser specific

Could you try to :
- set parameter to NO, and save
- set it back to YES, and save
- check log file for errors
- check value of parameterValue in table parameter for line with parameterCode='displayHistory' idUser={your user id}
the value should be YES, and there sould be one only line.