First, what is a "nr-7f00a"? Never heard this number.
Second, what version of Microstudio are you running? If it is not 2.311, go download it now and redo your tests. There were many bugs fixed in 2.311 from 2.303 and earlier versions.
Third, you have my attention, and help. Now, all you have to do is tell me exactly what you are doing (step by step using our buttons, fields, tabs, etc.) so we can create the same condition, or understand what you are doing. To get a factual answer, you must provide us the facts of your problem.
