It seems that with Safari 11, the 'safe mode' for plugins is more strict than version 10. In particular, a Flex application using FileReference.browse (to upload a user selected file) will no longer work when the user upgrades from Safari 10 to 11.
The workaround is for the user to disable 'safe mode'. But this is obviously cumbersome in the case of an application with large deployment. Another workaround could be to fallback on the html <input file> but cumbersome as well.
Did anybody else encounter this problem ? I couldn't locate any info on this change in the Safari 11 release notes.
This is unsurprising. Safari is committed to being very aggressive about deprecating Flash Player. If you have a large Safari userbase currently dependent on Flash Player, you should probably start putting your mitigation plans in place now, if you haven't already started.