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Spirent TestCenter: Stream blocks / Traffic Generator / Devices are greyed out and not available to edit them

Symptoms
  • Stream blocks  / Traffic Generator / Devices  are greyed out
  • Not able to edit it unless you do it one by one
Environment
  • STC version: 4.87 
  • Chassis: SPT-N11U
  • Module: MX-10G-S8, MX-10G-C8
Explanation/Resolution
  • Adding stream block to the configuration suddenly greyed out as the next image:
  • Also on the Device section, devices are showing greyed out
  • Even if you add new stream blocks it remains the same
  • There is no resolution for this behavior, possible cause it was a corrupted configuration.
  • Redoing the configuration from scratch worked and the Stream Blocks were showing as normal.

Product : Windows GUI,Spirent TestCenter