SQLFreeHandle hang

Hi,
My Application hangs on my second call to SQLFreeHandle's 'thread_protect(
SQL_HANDLE_ENV, environment );' line when I use the Threading option as
0/1/2. When I use Threading=3 the default it works fine.

For the above test I had ConnectionPooling enabled.

When I disable ConnectionPooling, the SQLFreeHandle with Threading=0/1/2 the
hang doesn't happen. Is this a bug in configuration or am I missing
something. My code is tuned to use the same Environment across connections,
do let me know how I could avoid this,

Regards,
Jay