Users in the Document Control group are not able to edit released files. The files open as read-only.
Solution
Edit the Doc_Control group options and change the option "Who can view the membership of the group?" to "Everyone".
Notes and References
Hardware/Software Configuration
Platform: INTEL
OS: window
OS Version: 2012_R2
Product: SOLID_EDGE
Application: DOC_MANAGEMENT
Function: INSIGHT
Ref: 001-7954496