Producción Científica ; Lack of timely instructors' support when the learners are struggling with the course contents and activities is one frequent problem of MOOC learn-ers. The early identification of these learners could help instructors spend part of their limited time assisting them and avoiding potential dropouts. This paper pre-sents a MOOC case study that explores the behavior of learners who reported problems in private messages and discussion forums. The study aimed at the identification of parameters that might allow the detection of learners struggling with different course aspects. As the results suggested, the comparison of the learners’ activity traces reveals some common sequences that in the future could facilitate the identification of learners facing problems, even without reporting them. On the other hand, statistical analyses on learners’ behavior showed non-significant differences between the learners reporting putting their maximum ef-fort to overcome a problem before asking for help and the ones who did not. ; Ministerio de Ciencia, Innovación y Universidades - Fondo Europeo de Desarrollo Regional (projects TIN2017-85179-C3-2-R / TIN2014-53199- C3-2R) ; Junta de Castilla y León - Fondo Europeo de Desarrollo Regional (project grants BOCYL-D-07062018-6 / VA257P18) ; Comisión Europea (project 588438-EPP-1-2017-1-EL-EPPKA2-KA)