JDeveloper hangs debugging pl/sql package

[Guest]

I am trying to use JDeveloper 10.1.2/build 1811 to debug a procedure in
a standalone pl/sql package.

The Oracle 9i (Release 9.2.0.5.0) instance is on a UNIX (SunOS 5.8)
server and my PC OS is Windows 2000, version 5.0 (build 2195: service
pack 4) with 1 gig of memory.

I am able to compile, set breakpoints and step thru the code up to a
specific break point. Then, no matter whether I resume, step over or
step into it goes off into who knows where and never returns. If I
comment the offending line of code, it hangs on the immediately
preceding line of code. If I comment the new offending line of code,
it hangs on the line preceding that one.

Anyone have any ideas or thoughts as to what is happening and/or how to
remedy this?

TIA

Luke