Can't play on same machine as server as of 1664

[Shadow-Wolf]

As the long title reads, since upgrading to the pre-compiled 1664 I cannot connect to ANY server while my server is running in the background. I get "An unknown error has occurred" any time I try to connect to my server or any other server like PEQ, P99, or EZ Server. These symptoms immediately disappear as soon as my server is shut down.

[Shadow-Wolf]

Strange I downgraded back to 1589 and it's still showing the same problem. When I got 1664 I downloaded perl 5.10 cause the new binaries required it, that's the only thing that changed.