not really sure but this is what I would try...
If multi-dll recompile all apps
If single exe, change something in the webserver like session timeout. Also go into your global data and just drill down through a field so this triggers full recompile.
Make sure 200% that the web folder is updated and correct, you have copied the nettalk dll across (if req) etc...
Failing all that drop a few trace calls in to see whats happening.