Is it possible that you had multiple Toads running at the same time?
If so, they could have stepped on each other while writing ToadActions.dat
You can avoid this by using the /VIRTUAL switch on your scheduled actions. This will cause the scheduled run to make a private copy of the user files folder.
FWIW, another user reported a similar problem a while back and reported back that /VIRTUAL helped him.
Just add /VIRTUAL on the command line call to Toad in the scheduled runs. There are some options with it (details in the help file) , but I think /VIRTUAL is all you really need.
