HI,
SyncToy 2.1 DO NOT sync system file "thumb.db", SyncToy ingore all the thumb.db in everytime sync.
The issue that you said may due to Win7/Vista new feature, pls check the information as below:
------
Thumbcache
Beginning with Windows Vista, thumbnail previews are stored in a centralized location on the system. This provides the system with access to images independent of their location, and addresses issues with the locality of Thumbs.db files. The cache is stored at %homedrive%\Users\%username%\AppData\Local\Microsoft\Windows\Explorer
as a number of files with the label thumbcache_xxx.db (numbered by size); as well as an index used to find thumbnails in each sized database. However, when browsing network shares with write permission, Windows Vista SP1 stores a Thumbs.db file in the remote directory instead of using the (local) central thumbcache.[citation needed]
More detailed click here.
Joey Liang
Your potential our passion This posting is provided "AS IS" with no warranties, and confers no rights.