I noticed a strange thing when using the FB^3 debugger. It started some time ago but had better things to do so I didn't look into it much. In the debugger control, the numbers for the function keys where missing. 'F1', 'F2' would all just be 'F'. I also found the numbers missing for the number of variable instances in the variables windows. It turns out that setting _NumberLeadingSpace to _false in the UserFloatPrefs files caused it. Since I don't like the leading space I changed it like this: compile long if def _useFBdbugger _NumberLeadingSpace = _zTrue Compile Xelse _NumberLeadingSpace = _false Compile End If