I've written an XML web service to check the version of the VBA in an
Excel file against the version stored in the database. If the version
in the database is newer, the user is asked if they want to update
their file. If so, the web service returns the stored code from a
CLOB in the database and passes it to VBA as a string. After deleting
all of the lines of code in the appropriate VBA module, it writes the
new code back into the Code Module as follows:

ThisWorkbook.VBProject.VBComponents.item(sCodeName ).CodeModule.AddFromString
s

As it iterates through all of the appropriate forms, modules and
classes to update, I always get a "Microsoft Office Excel has
encountered a problem and needs to close" message...

This is working for SOME of my code. But failing consistently on
certain modules. I cannot make a distinction between the modules that
are working vs. the ones that are not.

Am I missing something? Has anyone seen anything like this? Anyone
have any ideas of what could be causing Excel to crash or want to see
more code?

Thank you in advance.