When attempting to checkout a copy of a complete read only model user receives message in Error dialog box:
"Memory corruption in model, cannot complete request."
Hitting the OK button just closes the model and there is no option to save the model and continue.
This has occurred shortly after migrating some Common Action Blocks from an upstream model.
From this KB article installing Gen 8.5 PTF TSN85028/RO91356 should enable a save option but it has no effect. Also see same result when try to open model with Gen 8.6 Toolset with PTF IRN86100/RS94237 installed: CA Gen toolset checkout shows error that model "may have been corrupted. Do you still want to save it?"
As a workaround, the user can successfully checkout a subset with the PSteps in Full/System Test/Read, which pulls down about 70% of the model. However, there are times when they need to pull down the entire model to do some wide ranging changes.