To determine #1, for each version of the driver you've tried and with which you've experienced the problem, run `ident freetds_jdbc.jar' and report the date for the most recently modified source code file.
For #2, unless you're specifying ";tds=[version]" in your connection URL, you're using TDS 4.2. Otherwise, you're specifying the TDS version explicitly.
To find out the version of the JVM you're using (item #3), look at the output from the command `java -version'.
For #4, report the output from the query `SELECT @@VERSION' (this will tell us which service pack you're running as well as the major version number and the particulars of the operating system underneath the DBMS). Depending on the nature of your problem, it may also be appropriate to include other information, such as the character set installed. Use your judgment.
You can get the information for #5 from the output of `uname -a' on *n*x systems, or from `VER' on Windows systems.
For question #6, you need to pick up freetds_jdbc.snapshot.jar from [1] and determine whether the problem is resolved. If it is, you should probably just upgrade to the latest snapshot. (Remember, this is not production software -- the README describes it as a "sneak peek at an incomplete driver" -- so questions like "Is this version stable enough for my mission-critical production system?" aren't as appropriate as they would be in other contexts. You're welcome to contribute to the project's work to help get closer to that goal, though.) Be sure to inform the list in this case, so someone doesn't waste time trying to track down a problem which has already been resolved.
In addition, any code needed to reproduce the problem (including any stored procedures) should also be included. Try to reduce the problem to the minimum amount of code which is capable of exhibiting the behavior you're describing. Don't include any sensitive information (such as account names and passwords).
[1] ftp://freetds.internetcds.com/pub/freetds_jdbc/