We have tested the RadUpload control on a MacOS 10.9 with Safari 7 and it seems that the silverlight plugin cant access the file system.
When we attempt to upload a file it is displayed as a 0kb but also it indicates an error with the upload, a yellow triangle next to the file size indicating error. By hovering it we can see the actual error and that error is file access denied on our side.
This could be caused by Safari 7 settings( " OS X Mavericks delivers even better sandboxing protection in Safari by sandboxing the built-in PDF viewer and plug-ins such as Adobe Flash Player, Silverlight [read more
]" ). We consider that this is security limitation in the new MacOS 10.9 or Safari 7 browser and if you need to allow silverlight to access the file system you could ask the Mac support if that is possible. Basically if the RadUpload cant access the file system our control will not be able to work.
I hope this information helps.
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