On a new test server running AIX 6.1 and qdx5.7, a thread which does a curl::transfer call is panicking with a signal 4. This same thread configuration and tcl code works find on Sun 5.10 and qdx 5.7, and on AIX 5.3 and qdx 5.5. The TclCurl package is 7.16.2, it loads successfully. and no other tcl errors occur, but when the script builds and executes its web service call, the process panicks. The AIX installation was done by a unix admin (since it needs root access), supposedly there were no problems in installing any of the tcl libraries. No other tcl anomalies have been seen on this new installation. Anybody have any suggestions?