The file was massive but here is the part that had the tampering warning.
7/1/2010 8:50:46 PM Grooveshark: Got song <Unknown> - "Everclear - Wonderful" on '<unknown>' (ID 2218128)
7/1/2010 8:50:46 PM Plugin error while pre-tampering: System.InvalidOperationException
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
at System.Collections.Generic.List`1.Enumerator.MoveNext()
at SimpleSaverPlugin.TamperBefore(Session s, ProxyHandlingMode& mode) in E:\Codin' Projects\Saver Project\Saver2\SimpleSaverPlugin.cs:line 64
at Grooveshark.Grooveshark.TamperBefore(Session s, ProxyHandlingMode& mode) in E:\Codin' Projects\Saver Project\Grooveshark\Grooveshark.cs:line 55
at SaverPlugin.TamperResponseBefore(Session s, ProxyHandlingMode& mode) in E:\Codin' Projects\Saver Project\Saver2\SaverPlugin.cs:line 162
at Proxy.PluginMgr.TamperBefore(Session sess, ProxyHandlingMode& mode) in E:\Codin' Projects\Saver Project\SProxy\PluginMgr.cs:line 61
7/1/2010 8:50:50 PM #283 POST http://cowbell.grooveshark.com/guts.php
7/1/2010 8:50:50 PM #283 POST 932 bytes to cowbell.grooveshark.com
7/1/2010 8:50:50 PM Grooveshark: #283 matched http://cowbell.grooveshark.com/*
7/1/2010 8:50:54 PM #284 GET http://safebrowsing-cache.google.com/safeb..._____________8H
7/1/2010 8:50:55 PM #285 GET http://safebrowsing-cache.google.com/safeb...8v37RUrG_3_7_wA
7/1/2010 8:50:59 PM #286 GET http://safebrowsing-cache.google.com/safeb..._98_5OX798-__wA
7/1/2010 8:51:36 PM #287 POST http://cowbell.grooveshark.com/more.php?ge...KeyFromSongIDEx
7/1/2010 8:51:36 PM #287 POST 465 bytes to cowbell.grooveshark.com
7/1/2010 8:51:37 PM Grooveshark: #287 matched http://cowbell.grooveshark.com/*
7/1/2010 8:51:37 PM Grooveshark: getStreamKeyFromSongID: 7260578 -> b13123170575419abd9b
7/1/2010 8:51:37 PM Grooveshark: sniffed P.O.D. - "Alive" on 'Satellite' (ID 7260578)
7/1/2010 8:51:37 PM #288 POST http://stream53.grooveshark.com/stream.php
7/1/2010 8:51:37 PM #289 POST