HOW-TO:Share libraries using MySQL: Wiki Edition
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.
Texture Cache Maintenance Utility: Preload your texture cache for optimal UI performance. Remotely manage media libraries. Purge unused artwork to free up space. Find missing media. Configurable QA check to highlight metadata issues. Aid in diagnosis of library and cache related problems.

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RE: HOW-TO synchronize XBMC between every room in the house: Wiki Edition - by Milhouse - 2013-07-28, 19:34

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