r - RenderPlot returns invisible plot on my local machine, but it is visible on other machines -

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obligatory "i'm new r/shiny". in process of building app queries database, , returns plot of data retrieved. here generalised code being used return plot:

app.r

library(shiny) library(shinydashboard) library("rodbc") library(ggplot2)  ui <- mainpanel(fluidpage(       tabsetpanel(       tabpanel("plot", plotoutput("plot1"))               )            ))  server <- function(input, output,session) {         db <- odbcconnect(dsn="db", uid = "username", pwd = "password",believenrows=false )         plotquerytxt = paste("select * mytable")         mydata <- sqlquery(db, plotquerytxt )         odbcclose(db)         output$plot1 <- renderplot({ggplot(mydata,aes(column1,column2))+ geom_point()})   }   shinyapp(ui, server)

the issue here that, on personal machine, plot rendered invisible. when app run on other machines, or on remote server, plot can seen. question is: what causing plot visible on 1 machine, , not on another? issue graphics card, or along lines?

i have checked r packages date, don't think that's issue.

any suggestions appreciated!

thanks


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