Hi Janet,
I find it interesting that you're having trouble with thumbnails. Mine generally take no longer than a second or 2 to load, although my music library is only ~4600 files.
I haven't bothered with the thumbnail option so couldn't tell you about that. Sorry
The 'Analyse Audio' tool automatically levels the playing volume of different songs. When you import songs to your library, invariably they will have been recorded at different volumes meaning when you're playing them back, they'll play back at different volumes. Analyse audio analyses this, and when used in conjunction with the Player > Playback Options > DSP Studio > Volume Levelling option, levels the volume of all of your songs so that they play back at the same volume. VERY useful feature.
Regarding the network problem, bear in mind that if you access a MC library file over a network, only the first user of that library file will be able to make changes to it. Any changes that any subsequent users make will not be saved. For instance, if you have your HTPC running all the time, this will be the initial user and any changes you make on the office PC won't be saved. Shut the HTPC down, re-open MC and the library file on your office PC and that will be the initial user and any changes WILL be saved.
If you are simply looking at SHARING the library file between 2 PCs
* Activate the Library Server in the Services & Plugins Section
* On your 'Client' PC (The Office One) go to File > Library > Search for Library Servers.
Perhaps if you are going to be doing most of your tagging on the Office PC it may be easier to have the HTPC connecting to the library server on your office PC, though this would mean the office PC needing to be running all the time.
With regards to the problems you are having and not getting any responses - am just wondering if you have searched the forums before posting? There might not be much in the JRMC13 forum, but perhaps try the JRMC12 forum as there'll be plenty more in there. Perhaps also try the Help function within MC and the wiki from the link above.
Rest assured everyone here is here to help and you have chosen an awesome piece of software to construct your HTPC with.
Good Luck!