Colleague can no longer access shared folders/documents

I have a SkyDrive account for work where I have posted several documents in multiple folders. I shared these folders/documents with a colleague who has had access to them for years. She can no longer access the documents; however, she can see the folders--just can't see the documents to open them. The only thing that has changed is that I have purchasesd a Windows phone (Lumia 820) and created a new, personal account (live.com) using the SkyDrive app on my phone. I also linked my work account to my phone through IE. In order to access my work files from my phone, I had to share the work folders with myself, via my "live.com" user name. When I am in my work account, I can see that the folders and documents are shared with my colleague, but she can't seem to open them. Any suggestions??  Jan