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When I saved a snapshot using the self profiling feature with the export button, then it created a file name with the name "null". The next time during the same IDE session I try to export a snapshot with a different name, I get an error message: "Failed to save snapshot: Cannot lock read-only file <path>\null.nps." The file name "null.nps" matches the name of the previous snapshot which I had renamed from null.nps to something else.
is fixed in 7.1.2 patch *** This bug has been marked as a duplicate of bug 207962 ***