I feel sort of dumb...but I decided to look in the event log today. Every time I launch the "browse" button on the link editor, I get the follow error logged. I tried searching for this, but the sheer volume of unrelated issues has hampered my search. Maybe someone here will know more specifically what to look for as it relates to DNN.

Event Type: Information
Event Source: ASP.NET 2.0.50727.0
Event Category: Web Event
Event ID: 1315
Date: 9/29/2011
Time: 1:39:03 PM
User: N/A
Computer: COMPUTER
Description:
Event code: 4005
Event message: Forms authentication failed for the request. Reason: The ticket supplied has expired.
Event time: 9/29/2011 1:39:03 PM
Event time (UTC): 9/29/2011 6:39:03 PM
Event ID: 1fb12b8b04c040a0a9a857c467b91a93
Event sequence: 573
Event occurrence: 9
Event detail code: 50202

Application information:
Application domain: /LM/W3SVC/599050834/Root-5-129617802868648742
Trust level: Full
Application Virtual Path: /
Application Path: C:\wwwroot\
Machine name: COMPUTER

Process information:
Process ID: 19212
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE

Request information:
Request URL: http://intranet/default.aspx
Request path: /default.aspx
User host address: 123.456.789.123
User:
Is authenticated: False
Authentication Type:
Thread account name: NT AUTHORITY\NETWORK SERVICE

Name to authenticate:

Custom event details:

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.