This issue affects users of NFS file systems only.
The IQTMP15 environment variable is not set to point to a local directory.
Each client connection creates several directories and files in a temporary directory. Sybase IQ deletes these files when the connection ends. If IQTMP15 does not point to a local directory, it cannot find the .nfs* files that NFS creates.
Set IQTMP15 to a local directory and restart the server.