This was fixed in ClarisWorks 2.0.
Claris ships several communications tools with ClarisWorks. Other tools, such as the VT320 tool, are available from Apple and third-party developers.
If you save a Communications document from ClarisWorks 1.0 with the VT320 terminal tool selected, upon reopening the file you will get the message: "Could not configure terminal emulation tool." In addition, terminal settings such as cursor and host writable settings are not saved.