2013-07-28, 19:34
A debug log (wiki) may shed some light on your thumbnails problem.
Assuming your artwork paths are all accessible, it's most likely a case of your artwork being cached rather slowly by System (B).
You could simply copy the Textures13.db file and Thumbnails folder from (A) to (B), or failing that pre-load the cache on (B) with Texture Cache Maintenance utility.
However if (B) can't access your artwork files, then the debug log should reveal that.
Assuming your artwork paths are all accessible, it's most likely a case of your artwork being cached rather slowly by System (B).
You could simply copy the Textures13.db file and Thumbnails folder from (A) to (B), or failing that pre-load the cache on (B) with Texture Cache Maintenance utility.
However if (B) can't access your artwork files, then the debug log should reveal that.