iTunes Match keeps getting turned off on PC
My 3 kids and I share a common iTunes library on my PC. I have the most content and subscribed to Match, but I have a recurring problem. Everytime the are App updates for any of my kids, I have to log into the store with their accounts to get them. Everytime I do, iTunes Match gets turned off under the Store menu in iTunes. So, I have to constanly re-add my computer to the account and, since i have over 23,000 songs, this is not a speedy process.
Is there any way to avoid this?
iTunes is 10.6.3.25 and PC is Win 7 64 with SP1 and all updates in place.
Toshiba Satellite PC-OTHER, Windows 7, Home Premium 64 Bit with SP1