The document mentions 'Technology: Identity Services Engine (ISE) - 2.6 and Prior', which suggests that the software version being discussed is likely 2.6.0, as 2.6.0.156 is not explicitly mentioned in the context of the problem being described.
The slowness issue with the PAN node GUI was resolved after reloading the device, and the software version is inferred to be 2.6.0 based on the technology mentioned.