I am running into the exact same issue.

This is happening on my mobile device, tablet, and through the web interface.
And when i log into the "dockstar" interface, and go to "files I share", it says I am not sharing any files at all, which is not the case.

Please help...

Same problem. Huge Security Issue. I have been emailing support for a week now with no fix. Might have to shut the pogoplug down and call it quits.

I tried the steps by Rock but it did not work for me but this is what worked for me.

1. Launched the Pogoplug application and ensure you are signed into your account.
2. Click on "Web Access" button on the application and this will launch an internet browser that will take you to the site with you alright signed in.
3. Browse to the location of the folder or file you want to disable the link and right click on it then select disable link.

Now if that does not work for you, then it might be because of the browser you are using. Try using internet explorer to log into your pogoplug account and then perform step 3.