Microsoft said Tuesday that its investigation has turned up no evidence that anything in its November security updates should be causing users to encounter a so-called "black screen of death."
"Microsoft has investigated reports that its November security updates made changes to permissions in the registry that that are resulting in system issues for some customers," Microsoft security response communications lead Christopher Budd said in a statement. "The company has found those reports to be inaccurate and our comprehensive investigation has shown that none of the recently released updates are related to the behavior described in the reports."
Microsoft said it was not contacted by British security firm Prevx before that company went public with its claims. Microsoft said it has reached out to them to let them know the results of its investigation.
The company said on Monday that it would look into the matter, but issued an update later in the day saying it could not verify any issues.
"Our support organization is also not seeing this as an issue," Budd said on Tuesday. "The claims also do not match any known issues that have been documented in the security bulletins or (knowledge base) articles.
Update, 3:15 p.m. PT: Prevx posted an updated blog saying that it has done additional testing.
"Having narrowed down a specific trigger for this condition we've done quite a bit of testing and re-testing on the recent Windows patches," the comapny said. "Since more specifically narrowing down the cause we have been able to exonerate these patches from being a contributory factor."
The company also offered up a mea culpa to Redmond and said it also recommends users keep patching their systems promptly. "We apologize to Microsoft for any inconvenience our blog may have caused."