In the software business, that acronym often stands for the phrase "Can Not Reproduce". When it is used in response to a reported problem, it often results in frustration... not only for the person who reported the issue, but also for the person who investigated it. In most instances where situations like this occur, one or more vital details are eventually provided that help change "CNR" to "Ah ha! Now I see!" It has been my observation over time that the person reporting the problem sometimes thinks that all the details relating to the situation they are encountering are known by the person who is looking into the problem. In reality, that only works in some situations. In situations where it does not, incorrect assumptions are often made, which leads directly down the CNR path. Those assumptions can be minimized by providing relevant details when the issue is reported. This information can include:
If applicable, also identify:
It might be difficult to remember to include that sort of information in every situation, but it is certainly a good habit to get into.