Unfortunately, the Mac version of this update caused an issue for PitStop Pro: When one or more objects are selected in PitStop Pro, the selected objects and anchor points are not displayed. There is no fix for this issue, so Enfocus would like to advise PitStop users with a Mac not to update Acrobat at this time.
Enfocus has published a knowledgebase article about this.
A reader of PDF-AKTUELL already reported this problem with Enfocus PitStop in a (german) comment two days ago and reported another problem with Callas pdfToolbox.
Windows users are not affected.