Persistent warnings from earlier commands with RSt

问题:

I'm struggling to create a reproducible example for this, but I suspect others will know what I mean. Why does R sometimes seem to get stuck with a backlog of warnings/error messages that it repeats again after subsequent commands? E.g. you get some warning message Bad whatever system choking after running some code, which repeats again after you enter an innocuous instruction like x <- 5. This sometimes happens after several entries of x <- 5, although it normally stops after one or two.

R has been like this for me for at least 5 years, across many versions on both Windows and Mac. Am I alone? Does anyone know if it has been identified as a bug? I normally work with RStudio so I wonder if it's related to the IDE.

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Edit. Pretty sure this is related to RStudio.