How to Fix Block Attributes Not Updating (ATTSYNC) or Reading Backwards When Mirrored
Synchronize modified block attribute definitions across existing insertions via ATTSYNC/BATTMAN and stop mirrored text from flipping upside-down using MIRRTEXT = 0.
⚡ Quick Executive Fix
Run ATTSYNC > Select and click an instance of the modified block to push new/moved attribute definitions to all existing insertions. To fix mirrored text reading backwards, set MIRRTEXT = 0 and re-mirror the block.
1. Engineering Root-Cause Diagnosis inside the AC1032 DWG Database
Unlike geometric lines inside an `AcDbBlockTableRecord`—which update automatically across every insertion when edited in `BEDIT`—**Block Attributes (`AcDbAttributeDefinition` → `AcDbAttribute`)** are copied as independent child entities (`SEQEND`-terminated sub-chains) attached to each individual `AcDbBlockReference` at the moment of insertion. Consequently, adding a new `ATTDEF`, deleting a tag, or moving an attribute inside the Block Editor does not automatically alter existing block references until you explicitly synchronize the attribute table.
2. Step-by-Step Resolution Protocol in AutoCAD & GstarCAD 2027
1. Push Attribute Changes to Existing Blocks via ATTSYNC
After saving changes in the Block Editor (`BEDIT`), type ATTSYNC, choose Select (or `Name`), click one instance of the block, and confirm Yes. GstarCAD 2027 updates all instances while preserving the custom text values already typed into existing tags.
2. Reorder Attribute Prompt Sequence & Visibility via BATTMAN
Run BATTMAN (Block Attribute Manager) to reorder the prompt order, rename tags without losing existing values, or toggle Invisible mode across all insertions.
3. Prevent Mirrored Block Text & Attributes from Flipping Backwards
Set system variable MIRRTEXT = 0 (default is `0`; if set to `1`, `MIRROR` reverses text like a physical mirror). Note that for an attribute inside a block to stay right-reading when the block is mirrored, the attribute must be a single-line or multiline `ATTDEF` (not exploded raw lines), and `ATTSYNC` should be run if `Lock Position = Yes`.
3. Automated AutoLISP Diagnostic & Repair Script (C:SYNCALLBLOCKS)
Load the following production AutoLISP routine into GstarCAD 2027 or AutoCAD via APPLOAD (or add it to gcaddoc.lsp) to automate this repair across affected project files:
(defun C:SYNCALLBLOCKS ( / doc blk name)
(vl-load-com)
(setvar "MIRRTEXT" 0)
(setvar "ATTDIA" 1)
(setvar "ATTREQ" 1)
(setq doc (vla-get-ActiveDocument (vlax-get-acad-object)))
(vlax-for blk (vla-get-Blocks doc)
(setq name (vla-get-Name blk))
(if (and (= (vla-get-IsXRef blk) :vlax-false)
(= (vla-get-IsLayout blk) :vlax-false)
(not (wcmatch name "`**,*|*")))
(vl-catch-all-apply 'vl-cmdf (list "_.ATTSYNC" "_Name" name))
)
)
(princ "\n[SYNCALLBLOCKS] Enforced MIRRTEXT=0 and synchronized all attributed blocks.")
(princ)
)4. Diagnostic System Variables & Edge-Case Matrix
| Failure Symptom / Scenario | Command / SysVar | Production Remediation Rule |
|---|---|---|
| Added new attribute in BEDIT, invisible in drawing | ATTSYNC |
Pushes updated ATTDEF schema to existing AcDbBlockReference instances. |
| Text reads backwards after MIRROR command | MIRRTEXT = 0 |
Keeps text and block attributes right-reading when geometry is mirrored. |
| Attribute grips cannot be dragged individually | Lock Position = No (BEDIT) |
In BEDIT, set Attribute 'Lock Position = Yes' for dynamic actions, 'No' for free drag. |
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