OMG... i've always thought it was Right click over the node and then delete selected (which is always greyed out for the node itself and why i always resorted to the hypergraph connections). I never thought of going to the Edit > Delete node.... *bangs head on desk for being an idiot* Still can't Right Click in the channel…
Firebert: I've never had any issues deleting a node from the top of the history (right-click in Channel Box -> Delete Node), but you'll definitely run into issues if you try deleting a topologically-dependent (or topology-altering) modifier from the middle or bottom of the history. Stuff on top can be deleted as you want…
Check in the "UV Sets" menu there to make sure you haven't accidentally created a new map channel. If there's more than one there, select the other one and see what it contains. Also, there is a way back if you haven't deleted history, just delete the polyAutoProj node (or whatever it's called) in the object's history, and…
gradhopper: this is an easy fix. go to Normal > Set to Face select all your verts and perform a merge vertices operation. dial back the threshold so it doesn't weld everything into one vert, but don't make it too small of a value that you don't weld the verts that need to be welded to eachother. from there, you gotta make…