Does this happen only in the Local Media root view?
Or does it also occur in all the other views? (Audio, Video, Playlists, etc)
Do you have any other Media Library plugins installed other than the 4 default ones?
ml_online.dll (online services)
ml_wire.dll (shoutcast wire)
ml_xpdxs.dll (predixis musicmagic)
A my_plugin_list.txt file will reveal this or not?
for futher instructions/info (par. 7)
afaik, it's some ml plugin which causes this problem....
With Winamp closed, you could try editing gen_ml.ini (Winamp\Plugins folder)
Delete the values for these entries to reset them back to the defaults:
If the problem only occurs with the Local Media root view, then you can delete the file default.vmd (Winamp\Plugins\ml folder), which should reset that view to the default column sizes next time you reopen winamp.