Can you give a reproducible example? This works just fine for me:
library(shiny)
ui <- fluidPage(
tabsetPanel(
tabPanel("conditionalPanel",
checkboxInput("show", "Show"),
conditionalPanel("input.show", 1),
conditionalPanel("input.show", 2),
conditionalPanel("input.show", 3),
conditionalPanel("input.show", 4),
conditionalPanel("input.show", 5),
conditionalPanel("input.show", 6),
conditionalPanel("input.show", 7),
conditionalPanel("input.show", 8),
conditionalPanel("input.show", 9),
conditionalPanel("input.show", 10),
conditionalPanel("input.show", 11),
conditionalPanel("input.show", 12),
conditionalPanel("input.show", 13),
conditionalPanel("input.show", 14),
conditionalPanel("input.show", 15),
conditionalPanel("input.show", 16),
conditionalPanel("input.show", 17)
)
)
)
server <- function(input, output, session) {
}
shinyApp(ui, server)