A beta release of OS X Mavericks 10.9.5 held a surprise for Mac developers thanks to changes in the Gatekeeper app security feature that could leave end users scratching their heads wondering why apps no longer launch. Apple is changing how apps will be digitally signed to verify they aren't malware, and developers will need to recompile their code to comply with the Gatekeeper update.
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This surprise change to Gatekeeper will no doubt be a serious pain for some developers and confusing for some end users. Making the change now, however, instead of this fall with Yosemite's release gives developers a head start on updating their apps. That said, this was a pretty big surprise to spring on developers unannounced.