May I have your attention?
Here goes, taken from frontpage:
Rolling Corruptions no longer use the initial haste value indefinitely. This is really more of a bug fix than a nerf. The problem here was that players could inflate the initial cast of Corruption and have the spell tick for that damage indefinitely as long as it was refreshed. This resulted in some "jaw dropping" damage. Technically this was a tricky one to fix but we wanted to keep the Glyph of Quick Decay and were able to ultimately find a solution. When this fix goes live, the hasted Corruption should correct itself to your current haste within a tick or two of the spell being refreshed.
Ideally, we'd rather make changes while we're still in PTR before a patch goes live, but in the end we'd rather make changes than allow something imbalanced to continue just because we didn't change it pre-patch. To the community's credit, some players predicted these issues might become a problem. We appreciate the feedback as always, even if we don't always immediately make changes suggested by the community.