Serial port doesn't close properly

I'm working with the RXTX comm APi to connect a java application (jdk 1.5) with a mikrocontroller via a virtual serial port (using WinXP). I'm only jumping to certain addresses of the controller and then write into or read from them.
After some tricky problems that were already discussed in this forum I now encountered a new one:
After I finished my communication with the controller, I want to make a clean shutdown by closing the input- and outputStream, removing the SerialEventListener and finally closing the serialPort.
When I'm doing the latter, the program suddenly hangs totally. No exception is thrown and I have to terminate the application through the ide.
I monitor all the port traffic with "portmon" from sysinternals and it tells me that around 5 minutes after I tried to close the port, the javaw-process finally sends "IRP_MJ_CLEANUP" and "IRP_MJ_CLOSE".
Sometimes only the first one is sent, what makes it impossible to connect to the port again without a restart of windows (port in use by unkown application).
I don't have the sourcecode right with me now, so I can't post some examples. However I'm basically doing nothing else then most of the other sourcecodes concerning serial port connections posted in this forum. Anyway I will post some code later.
But for now, has anybody some ideas what could be the problem?
********* EDIT **********
Seems that it's not necessary to post my sourcecode because the same problem occures when I'm running the SerialDemo from the javax.comm 2.0 API.

Here's an update. The serial port works fine, as long as I don't have any I/O pci cards in the machine. Both my Adaptec SCSI controller and a Pinnacle AV card cause the same malfunction with the serial port. When those cards are removed, it works! No conflicts with IRQ or anything that I can see.....no errors reported by windows device manager.
P

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1. If you keep giving me good advice like this, I'll be tempted to change the background to Baltimore prison purple.
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Message Edited by Ravens Fan on 01-13-2009 03:55 PM

Serial port doesn't close properly

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