Thanks for playing!
Your mention of the inventory is a real problem I fought for a long time. My suggestion is when selecting from the inventory make sure there's nothing behind it (I.e. a cupboard etc.) and select from the top half of the inventory 'box'. I've had a lot of issues with object layering. So likely when you're selecting from the inventory it's getting confused which item you're actually clicking.
By reading the text I assume you mean the text on the items? I wans't really able to find a 'good' font for the size restriction. I completely agree that some items 'hovertext' isn't the best.