Although research indicates that most clients who initiate DBT PE report a reliable improvement in PTSD, a minority of clients do not experience a significant change in PTSD. When progress is slow or limited, therapists will need to work with clients to determine what is interfering with treatment and generate potential solutions. In this process, it is important to consider the behavior of both the therapist and client as potential contributors to the lack of improvement. Therapy-interfering behaviors of the therapist may include factors such as non-adherence to the protocol, issues with assessment and treatment planning, and colluding with client avoidance. In addition, clients may engage in a variety of behaviors during DBT PE that limit its effectiveness by reducing contact with trauma cues, disrupting emotional activation, and interfering with processing and retaining corrective information. In this 1.5 hour webinar, a principle-driven and step-by-step approach to troubleshooting problems that may contribute to lack of improvement during DBT PE will be presented, including methods for defining and assessing treatment non-response. Case examples will be provided to illustrate common problems and associated interventions. Finally, factors to consider when deciding whether to pause DBT PE due to lack of improvement will be discussed.