After releasing signature update S749, we discovered a defect that significantly impacted the performance of the AnalysisEngine application running on the sensor. This defect is documented in CSCul00198. Having identified the root cause of the problem, we have provided a fix in signature update S750 and enhanced our test suite to detect this condition in future signature updates. In order to avoid this issue do not upgrade to S749 (it is no longer available for download); instead, upgrade directly to S750. We apologize for any inconveniences this may have caused.