We have a couple custom .mnu for inserting commonly used blocks. One is a dynamic J-bolt, with several visibility states, plus stretch and move parameters. It had a wonky insert point, so when I had some down time I decided to fix it. Everything went well until I tested the item to see how it worked. When I insert it for the first time in a drawing, Everything works fine, but if its inserted again from the menu it comes in exploded. If you open the insert, the explode check box is checked. No other item on the menu acts the same way.
Any help appreciated as this is driving me nuts.