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See https://netbeans.org/bugzilla/attachment.cgi?id=156595 added to https://netbeans.org/bugzilla/show_bug.cgi?id=169096#c25 As this concerns C++ sources, the cause is likely different than that solved in the referenced issue. Most likely messages.log file would be required to see if there were some exceptions thrown, that can cause this behavior.
Created attachment 156597 [details] log file
Created attachment 156598 [details] screenshot
Clarification: breakpoints are shown during editing, but dissapear when debugging starts.
there is no information in messages.log. It was in 8.0.2 so hopefully it is already resolved