jswat not stopping at breakpoints

i've used previous versions of jswat 3.x to debug webapps running in
tomcat with much success, but after upgrading to 3.6 some time ago,
i'm experiencing an odd phenomenon - my breakpoints are being ignored.

here's what i did:

1) in a new session, added a few directories to the source path
2) started tomcat (5.5.9) with 'jpda start'
3) attached the session
4) opened a source file by finding a class in the classloader for my
webapp in the Classes panel
4) set a breakpoint on a line of code in the source file
5) made an http request to tomcat

jswat never stopped at my breakpoint but sailed right past it.

i'm sure i'm doing something silly, but i can't figure out what it
might be. have i overlooked something obvious? thanks!