The solution is to delete all code above and delete all code below the "insert into" statement, and then run the SQL code for the insert into. This must be a bug. I had a prior version of SQL Assistant on Windows XP, and it worked fine. Not since my upgrade to enterprise windows 7.
I had set the Tools, Options, Query checkbox for "Submit only the selected query text, when highlighted".
But when I use "Import Data", that hightlighted selection fuction is ignored, so all insert attempts fail if there is other code above or below.
Starting with SQL Assistant 15.0 the option "Submit only the selected query text, when highlighted" now applies to Import also.