Using the loft scene everything as default,
I get these anti aliasing problems and I was wondering if there is something I can tweak to remove this?
I get the same problem with anything I give a glow effect.

This is a long time going bug. Long story short... the size of the view-port attributes to glowing edges quality (as well as flickering in some cases). I see you have entered into FT. Not sure if anyone else did (maybe wildstar).
I kind of got used this and workaround it with view-port size and a DSR trick (search for DSR at the forum).

So here it is, the same loft scene fragment render:

View-port size ~300px wide, supersampling is ON x3


Render outcome:


Full size viewport (Ctrl+7), supersampling is ON x3



Render outcome:


DSR "trick"  computer screen resolution switched to 4K, Full size viewport (Ctrl+7), supersampling is OFF. Render outcome:

4u2ges Thanks! I would have never expected such a solution.
I'm late the the show so I got a bit of catching up to do.
The only mystery I need to solve now is what is FT?

FT = Feedback Tracker. 

Gerry

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System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.

https://www.reallusion.com/FeedBackTracker/

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iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
Laptop - Windows 10, MSI GS63VR STEALTH-252, 16GB RAM, GTX 1060 (6GB), 256GB SSD and 1TB HDD

I raised this a while ago and done some digging in to it .
https://forum.reallusion.com/350592/Dark-lines-and-jagged-geometry

I forget the exact nature now but it seems some  3d models are not created correct to work inside of iclone  .
In RL guide for developers it sets out the settings you need to use when creating 3d models in maya and max fro use in iclone. And it states jagged edges in animations are a result of these rules not being followed. Also caused by the wrong  UV settings as well. . I might well be wrong but that's my understanding of the problem. Saying that the loft scene is a modern and should work fine.

This is something different. Not the geometry, nor texture are in play here. It is only when the object is in front of the other object, which is fairly well brighten with a glow map.

Back to the loft scene. There is no scene actually. I only left glowing sky, one key light, one tree and a primitive cube with bump and texture maps stripped. No IBL, no GI.
Final render with normal view-port, high quality shadow, super-sampling is ON x3:



And what is that dotted line on the left side of the cube? You guessed it! A soft shadow from the tree on the right.

Take the tree out, disable sky glow and the cube is back to normal: