Content issues, i.e. issues experienced purely based on DAT versions, is something to take up with McAfee Labs via the Support escalation process.
The behavior may be specific to the DAT version, it may be related to the "Artemis" capability within the DATs (have you tried playing around with the Artemis setting?).
The content is dynamic, changing daily, but with some effort one can identify which DAT version introduced the change in behavior - that allows McAfee Labs to hone in on what detection routines were modified that are likely contributing to the delay.