I got a question about this issue and wanted to share the solution I was given by an Autodesk employee a time ago. This occurs when you have Microsoft Visual Studio and ADT/ABS 2006 installed on the same machine. Add this row below as the first row for the formula (a tip is to copy this row and paste it into the FPD editor so you don't get a popup for each character entered):
on error resume next
Another solution is this. In Visual Studio, select [Tools] --> [Options] --> select [Debugging] --> [Just-In-Time] --> turn off "Script ." It should then stop the debugging window from popping up.