Yup, the version I mentioned before is now released as beta 3.3.0. Included also in this release is that if you click 'Resume' when the download has gone to Awaiting Sources, it will automatically attempt to reconnect to the hosts it initially tried downloading from. (Thanks goes to trap_jaw for the code for that.) That should solve the problem you mentioned.

If you close LimeWire and re-open, the above automatically occurs.