As the title says Unity’s uGUI seems to be having rendering issues when in Deferred rendering mode. Is this a known issue? Should UI cameras always be in Forward Rendering?
As a further note, I’m using the Alloy plugin’s Deferred shader as the default deferred. I’m not sure if that may be causing issues.
This may help, not sure what version of unity you are using:
I’m using the latest patch release for Unity 5. Patch 5.1.2p3
Is this on your build too? If it’s not an issue on your build, I’d just submit a bug report and wait for some feedback, or someone else on this thread.
Screenshot?
I haven’t tried a build yet, I’ll get back to you with the results.
The screenshot is unfortunately just a black screen because the UI covers the whole camera.
In what way? 
And the UI issues… is it just wrong depth sorting or game-breaking glitches? 