Excel 2003

I have VBA code stored in an .xlA file (not installed as an 'AddIn' in
Excel); the code opens up an .xlS file and does a lot of data
manipulation and importing data from other files; at one point, it
opens an .xlT file (there is code stored in 'ThisWorkbook' module using
'BeforeSave' Private Sub). A specified worksheet is copied from the
workbook that was 'Active' immediately prior to opening of the .xlT
file to the .xlT file; then, a 'SaveAs' command saves the modified .xlT
file as an .xlS file with a new filename. At this point in time, the
spreadsheet becomes 'invisible' (only reference on Taskbar is VBA
code), although it is still open (I am using two monitors to step thru
the code; VBA on the right monitor and spreadsheet on the left
monitor.).

The macro continues to process code correctly, but can someone explain
this behavior.

Thanks for a response,

JingleRock