Depending on (a) how many incomplete files you have & (b) how many files you're sharing, LW takes time to account for them all after opening. It's always best to allow LW to settle down 1st before doing anything. When you 1st open LW all the files in your LW Library window will be red. But one by one they will turn black. Only after they have turned black can you play them!
Here's some hints on ooptimising LW:
A well set-up LW can start to automatically continue its dwnlding after it's settled down perhaps 2 out of 3 times you open LW. Optimising LW & Maximising Uplds & Dwnlds A (1st post only) & also Part B which is even better & last & least are search & dwnld hints.