Ok, I've been playing around with this for a few days and had a few others test it with the same result.

Grab a mining rig, start mining a roid and then go to nav/pda/inventory. It hangs and the only way out it to hit the ESC key.
Now, I've noticed this ONLY happens if the player has a lot of "inventory" scattered around the verse. I tried this with my alt and it worked just fine.

If more people can test this, I'd appreciate it.

Yes that's a major problem. What happens is the inventory is constantly being updated and the inventory window is constantly refreshing due to the changes in inventory.

Thanks for the explanation. (it makes sense) Hopefully this can be addressed at some point.