I'd like to reply to your problem, since I had the same trouble with my inventory valuation not balancing to my inventory gl acct. My Inventory GL Acct balances were correct but not the Item valuation.

I have corrected the problem by not posting adjustments in Inventory (IC) before Order Entry, Inventory & Purple PO's day end's are processed. The adjustments made before Order Entry and PO's were posted may have been retrieving the wrong values since not updated.

Also make sure your Inventory Day ends are done after transaction are retrieved into inventory, ie: After every Order Entry Day End.

Hope that's useful.