There's a known problem where chained LEI activities will fail (Lotus Tech Note 175633) if the name has 13, 29, 45 ... characters (N x 16 - 3, where N = 0,1,2 ..).
Add a column to the activity view in the LEI admin database with this formula to display the name length and if it's an issue for each activity.
m_Length := @Text(@Length(Name));
m_NameLen := @Length(Name);
m_issue := @If(m_NameLen = 13 | m_NameLen = 29 | m_NameLen = 45 | m_NameLen = 61 | m_NameLen = 77 ; "Yes!!" ; "No");
m_IsIssue := @If( m_NameLen > 77; "Name > 77!" ; m_issue);
m_Length + "(" + m_IsIssue + ")"