When a XIF file is imported in XBuilder, one or more SNVT's show a strange icon rather than the input or output symbol and even though the SNVT is supported.
TAC XBuilder doesn't support multi line self documentation string for SNVT's
 Locate the SNVT name(s) that has the issue (e.g. "VAR nviMode")
 Delete all lines in the self documentation except from the first (Don't just place all the text on one line, as there is a max for characters on each line)
 Import the XIF file again