Florence,
Not sure what may have caused this to occur. It may be that the software is not looking in the correct location for your shared resources. There is an article on the knowledge base that will guide you at www.prometheankb.com, select your region/language, in the search box type in 10399, the title of the article is ActivInspire- Locating Shared Resource files for ActivPrimary, ActivStudio and ActivInspire. (case# 257942)
Thanks!