Yes. Believe it or not, they aren't "bugs"; they are "features." Apparently the way you and I have been making vertex models for the last ten-odd years is wrong, and the designers wished to gently force us into correct techniques. Unfortunately they can't seem to explain what those are, or apply them consistently. Half the time, my dear doctor, when Carrara blips up that annoying "Can't do THAT to a polygon!" you can go ahead and do it anyhow by using the hotkey sequence instead of the tool menu. Or vice-versa. One thing; control-X seems to delete the way we expected it to (delete is now more like "remove point and rejoin mesh around it.") For me the most annoying new habit is the auto-complete of faces -- which always seems to have strange guesses. If for some reason I am filling faces by hand on a simple extruded cylinder, after I have filled one Carrara will jump ahead and create a poly face that warps across the middle of the cylinder (and is non-planar to boot). Then it will cry that my mesh isn't empty, or has more than two edges, or something. And as I try to remove this face it will instead tenaciously stick to any vertice it can find; like a flapping bit of 3d flypaper. I have found that filling such things requires working as one would tighten the bolts on a cylinder head; work back and forth across the space and with luck you will thwart the excess faces. As for the "Can't do ____ on a polymesh; please empty it first" (which appears REGARDLESS of whether the polymesh is, indeed, empty) I have no solution. The last time I had to fill a tiny missing wedge to an otherwise built model (a prospect that would normally take one link, and one fill command), what I finally did was added a new vertex to one of the edges of my triangular gap, drag that by hand until the gap was hidden, then weld. I believe I had to use hotkeys to do at least one of these operations, too, as I guess Carrara had decided one or more of them was illegal as well. If you want to put up with a slow and frustrating process you might try submitting a bug report. I haven't seen any action on the bug tracker in last ten days, tho. Perhaps they are off at a trade show.