Full text search in a TBIE index cannot be performed when files are stored on a network location. Doing a field search successfully gives results.
When indexing with TBIE on a share, the user running the ZyLAB_IM_Service must have access rights to the directory where the files are located
Be sure that the Windows account running the ZyLAB_IM_Service has rights to read the files that need to be indexed. Once you have made sure to set the appropriate privileges, you will need to do an erase and build action on the index that is affected.
6.2; 6.2 Service Pack 1; 6.2 Service Pack 2; 6.3; 6.4