So, working on a client project, and 20072 is acting very wonky. First, I am trying to do a plain ordinary sweep boss. It's for a u-bolt, and so I put two circles on the first plane, and click the sketch icon to close that...... hey what's this? The sketch won't go away, it stays as a ghost image, even though sketch 1 is shown and the icon indicates it's closed. I close Alibre and re-open.... same thing. Finally it seems that goes away, I put the path on the normal plane, and the bolt is swept apparently OK, no errors. But maybe not...... I go to put the bolts in an assembly, and when I try to get them lined up and tangent aligned so they stay put in position..... tangent outside gives an error of overconstraint. What the ....... ? I try tangent inside, same thing. This seems to be persistent... BUT.... Then I close and re-open the assembly. Hey, it did the tangent inside when it opened! OK, I edit it to be tangent outside, which is what I want, and again it refuses with an overconstraint! Finally I make it visually OK by hand, and move on. But what is going on? This is pretty inconsistent, and weird. That seems to be an ongoing issue with 20072. Still got the memory leak. Have run out of memory more than once even with 16 gB. Got odd problems that pop up and seem to have no cause, such as this constraint issue.. As far as I can see, there is nothing about this machine that should be a problem, it seems to be at least "good enough" and probably better than needed. So, what is going on?