Yes. Models that use dynamic cell references, probability functions (such as CB.IterationsFN) or inter-trial dependencies cannot be used in turbo mode, and must be reconfigured. In addition, if any add-ins are used, such as the Excel Analysis Toolpak, the user must be sure to have these add-ins installed on each worker. Also, macros that have been specially designed may require additional effort to run in turbo mode.