Moved to Windows install from NAS, SC can't see local music directory

[JadeMonkee]

Hi Guys,
I've been wanting to improve the performance of SC by moving it from my ReadyNAS Duo to my Windows PC for a little while now, and I spent all day yesterday doing so.
And it all worked last night, and I was happy.

Only, this morning, my library was empty. I ripped a CD, and rescanned before I went to bed, but it seemed to be working fine.

Here's what I did yesterday.

I installed SC Version: 7.5.6 - r32834 @ Wed Jul 27 02:04:27 PDT 2011 on my Windows machine, and copied my music over to a local disk (D:\Albums).
EDIT: I only chose 7.5.5 because I didn't want to be a 7.6 guinea pig, but if an upgrade means a solution/workaround fir this problem, I'm open to it.

I actually keep a USB backup (NTFS formatted) of my music, so copied it over from there, rather than my NAS, because it's faster.

Anyway, this morning, after I realised the library was now empty, I opened the control panel and found the library was referencing my old NAS install directory (now deleted).

I noticed last night that I couldn't see my local music directory (D:\Albums) while selecting it from the web interface -- even though it appeared in the Control Panel.

I thought nothing of that last night, so I just specified it in the Control Panel.

But now, with the web interface still not being able to see my library (even though the Control Panel still can) I believe it's a permissions issue, probably related to copying the music over from my USB drive (which had copied them over from my NAS using the Microsoft SyncToy).

I can get a scan running from the Control Panel, after selecting the local music directory, but I fear I will run into the same problems tomorrow (and I want my SB Boom to wake me up for work!).

Also, I had the server running at startup (not login). Would this make any difference? I assumed that I provide my Windows username and password in the fields provided. The lack of help files/documentation on the Control Panel is woeful. I miss the SlimDevices days.

Your help is appreciated. Thank you in advance.

EDIT 2: I just had a thought... is it possible that the library disappeared because i triggered a rescan from within the web interface, cf the Control Panel?
I shall investigate...

EDIT 3: Nope... rescan from web interface worked fine. Hmmm... I wonder if the library disappearing may have been a once off thing?