Have you verified that the ShowHistory menu (on View) is checked? Check it if it is not.
If it is already checked, please try the following. Go to the execution directory and execute verify.exe. This will write a log file to your Temp directory. Please send me the log file. (mike.dempsey@Teradata.com)
Also go to \Documents and settings\\Application Data\Teradata\SQL Assistant and send me the files UserOptions.config SQLAError.txt (if it exists)
That should give me some idea as to what is happening here.