Rstudio Server Highchart Opens New Tab - highcharts

I have an unusual issue (can't find anything on SO or Google).
I have installed Rstudio on the amazon cloud. When I try to run any code to produce a highchart the instance opens a blank tab.
Here is the simple code I am using...
library(highcharter)
md <- (1:10)
hchart(md)
The first two lines run fine, but when I run the third line a new tab opens with the URL...
http://my.cloud.url:8787/file_show?path=%2Ftmp%2FRtmpUwu8Vb%2Fviewhtml777930f3f5e2%2Findex.html
Has anyone seen this issue before / know what is happening or how to resolve?
Thanks
Mike

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