# Multiple startup errors and no SimpleITK in May 1 nightly on mac

**URL:** <https://discourse.slicer.org/t/multiple-startup-errors-and-no-simpleitk-in-may-1-nightly-on-mac/231>\
**Category:** Support\
**Tags:** bug\
**Created:** [May 1, 2017, 1:44pm UTC](https://discourse.slicer.org/t/multiple-startup-errors-and-no-simpleitk-in-may-1-nightly-on-mac/231 "2017-05-01T13:44:44Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![fedorov](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fedorov/32/14_2.png) [@fedorov](https://discourse.slicer.org/u/fedorov)\
**Post date:** [May 2, 2017, 2:24am UTC](https://discourse.slicer.org/t/multiple-startup-errors-and-no-simpleitk-in-may-1-nightly-on-mac/231/8 "2017-05-02T02:24:04Z")

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It seems that something happened between r25945 (2017-04-25 nightly, works) and r25971 (2017-04-26 nightly, doesn’t work).

As part of this process, I also discovered a new “feature” of macOS + Slicer: apparently, it is no longer possible to allow launching apps from unidentified developers, so every time new Slicer is installed, it has to be launched twice, second time allowing to launch in the security panel. Quite annoying, considering initial launch of Slicer on mac is super slow, and macOS verifies package on each of the 2 launches…

![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/1/7/176ea84ea65426409c0350396d7f14069a798417.png)

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_[View the full topic](https://discourse.slicer.org/t/multiple-startup-errors-and-no-simpleitk-in-may-1-nightly-on-mac/231)._