Has anyone noticed that the origin seems to change?
I can lay a bunch of parts and traces. When I add new parts and come back and move traces, etc. I've noticed that the origin has changed and all the traces and parts are now off and I have to go back and re-align them.
No can't say as I have, not unless I specifically move the origin.
It can be a bit funny about snapping to grid if something is off-grid, and you may not have the part origin where you expect it, in that case, I just say to heck with it, hit F11 to turn the grid off, move the part where it needs to go, and F11 to turn the grid on again. Remember you can move parts with the arrow keys for fine control, the more you zoom in, the more fine the movement.
NB: You should be using Version 2.4 now, it was released end of July. Just in case you were still using the Beta.