I've been using version 1.89beta2 almost everyday for about 6 months. I use it to sync Itunes -> Itunes Agent -> WMStorage.
Works, fine, but the other day I backed up using Sprite and saw an error saying that my root was low on memory. Sure enough the device storage memory was low, down to 3MB. I searched using Total Commander and found this huge file, over 24MB, called WM5drvlog.txt.
Googling brought me this thread where I see it should be much smaller. I renamed and deleted it with no ill effects -- WMStorage worked just fine and now that file has been re-created at about 64Kb.
I don't know if uninstalling the software deletes the file. If so, it would be easier to do that and reinstall rather than finding and deleting it.
Just thought I would document this. No action requested or necessary