From CADtools 2.1 for Microstation and onwards, CADtools can print debugging messages to the Message centre. 
To enable debugging, follow these steps
1. Right-click the Message Centre area and select 'Properties'

2. Tick the 'Display Debug message' check box

3. Debug messages will then appear with a small 'cog' symbol, and CADtools debug messages will be prepended with 'CADtools:'

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