@Anonymous Very good question. I suggest.
- On opening, remove the association with the sheet set if asked.
- Ignore unresolved references if asked.
- Switch to model tab.
- Audit the drawing. Choose to fix errors.
- After audit, do a complete purge of unreferenced items, purging nested items.
- Right click and unisolate.
- Zoom extents and delete the wild xx block at the lower right corner of the drawing.
- Zoom extents again.
- Save as another drawing.
- Close and reopen the drawing. Everything left should work correctly.
This is a record of the audit which shows lots of issues with self-referencing blocks. Got to be careful with block naming:
"
Fix any errors detected? [Yes/No] <N>: y
Auditing Header
Auditing Tables
Auditing Entities Pass 1
Pass 1 6800 objects auditedAcDbViewport(12C68F)
Paperspace vport layer Not "0" "0"
Pass 1 59900 objects audited
Auditing Entities Pass 2
Pass 2 59900 objects audited
Auditing Blocks
200 Blocks auditedReference to a deleted block 281
Blocks are self referencing
Block "*T" references block "*U"
Block "*U" references block "*U"
The reference to block "*U" from block "*U" will be deleted
Reference to a deleted block 282
Blocks are self referencing
Block "*T" references block "*U"
Block "*U" references block "*U"
The reference to block "*U" from block "*U" will be deleted
Reference to a deleted block 283
Blocks are self referencing
Block "*T" references block "*U"
Block "*U" references block "*U"
The reference to block "*U" from block "*U" will be deleted
Reference to a deleted block 284
Blocks are self referencing
Block "*T" references block "*U"
Block "*U" references block "*U"
The reference to block "*U" from block "*U" will be deleted
Reference to a deleted block 285
Blocks are self referencing
Block "*T" references block "*U"
Block "*U" references block "*U"
The reference to block "*U" from block "*U" will be deleted
254 Blocks audited
Auditing AcDsRecords
Regenerating model.
Total errors found 6 fixed 6
Erased 0 objects
Architect, Registered NC, VA, SC, & GA.