Hm.
Watching is only relevant for .tcl library files.
However, the templating system does its own caching of compiled .adp files, in that it compiles the .adp file into a proc in a certain namespace, which is the reused.
I'm actually not too familiar with the details, but I do recall having been bitten by an .adp page not being up-to-date wrt the .adp in the file system.
Reuven, can you help us by clarifying whether this was a library /tcl/*-procs.tcl file, a www/*.tcl file, or a www/*.adp file?
/Lars