Blocks randomly dissapearing

[Anonymous]

I have a drawing in which a specific block keeps dissapearing from a drawing, I then have to go back to the original drawing in which I have saved somewhere else and copy and paste the blocks.  It is not the layer, because the other objects in the drawing on that layer are shown.  I am completely stumped.  Attached is the drawings where the blocks have dissappeared, and the original drawing with the blocks shown.  The layer that the blocks are on are -WSHED-NODE2 and -WSHED-NODE1..... You can see the leader lines point to nothing in the drawing with the blocks dissapeared.....  Any help would be greatly appreciated.  Thank you!

[Anonymous]

I found out that they dissappear whenever you delete any object in the drawing.  I found a work around for now, if I world block out the nodes, then copy them from the new drawing into the drawing where they dissappeared, that solves the issue, but I would like to know what this is and how to prevent it in the future. 

[Jay_B]

Without more direction as to the blocks in question, I did notice a bunch of GROUPS within the file.

Not sure if it helps but GROUPS are not maintained when copy/pasting from dwg a to dwg b.

[Anonymous]

What are groups?

[Jay_B · Accepted solution]

Groups are a means of combining drawing objects in a drawing.

More info Here

In the drawing containing your blocks, click one of the pentagon shaped callouts & if you see a rectangle appear, that's the tell tale those objects belong to a group. The Ungroup command gets rid of a group.

HTH

[Anonymous]

Awesome, that works!  But I have to ungroup them one at a time?  Is there any way to ungroup all of them at once?