'Not Authorized' on campaign I've joined

Applied to a campaign as a player. I believe I was accepted, as I've received several messages in the red upper-right icon saying I've been accepted, and showing me comments from the campaign page. Upon trying to view these comments, I'm brought to a blank white webpage saying 'Not Authorized'. I look to 'My Campaigns', where it says that I'm not currently enrolled in any campaigns. I go to the campaign's LFG page, where it says above the description, "You are already a participant in this Campaign! To access the campaign, visit the [campaigns_details_page]". Upon attempting to access the [campaigns_details_page], I'm brought to the same white 'Not Authorized' page. Windows 7 Chrome 22.0.1229.94 Also tried on Firefox and IE. In IE, the message was different--it was the standard IE "This website declined to show this webpage HTTP 403" page. I can probably provide screenshots if requested.