The CellProfiler team is pleased to announce the release of CellProfiler 2.1.1! Download it from cellprofiler.org.
In this minor patch update, we have dealt with a number of bugs, mostly reported by our faithful users Also, we've improved color image stacks handling, improved performance for image stacks in general, and improved compositing of overlays on images. More details are in the release notes.
This update should be considered non-essential but really, why wouldn't you want to update?
The CellProfiler team