Unable to change port in Source DSP

[ObsidianDream]

Hi,
Its been a few years since I used winamp and the dsp plugin.

My trouble is when I try to enter my port (at default it is 8000)
1) I cannot delete the 8000
2)if I try to enter my port anyway, I can only type in a series of zeros (no other numbers show up)
3)after typing the zeros the port changes to 65535

I have tried reinstalling both Winamp and the plugin, also I bypassed my router and connected directly to my modem.

Thank You for your time.