Experience with Vba code used to export data from MS Acess to MS Excel

We have an Access database that has a routine to export sets of data to excel. I asked our freelance Access programmer to add an extra column of data to the export. In doing the job he changed the way access exported the data to excel. Now the export works on my pc (windows 8.1, access 2007, office 2013) but does not work on my colleagues machine (windows 7, access 2013 [was 2007], office 2013)

We tried upgrading the version of MS office on the colleagues machine, as my machine was running office 13 and she was running ms 2007. That didn't work and my access programmer gave up. The exports in the previous version of the database work on the new install of office 13, the exports in the new version do not.

I am looking for an experienced vba/office engineer to find the needle in the haystack and solve our problem.