shiny - R markdown with RGL gives "You must enable Javascript to view this page properly" error -

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i have downloadhandler() in shiny generates html document using r markdown. document generates rgl plots, added document using hook_webgl. application running on shiny server. works fine first time download button used, on following occasions error "you must enable javascript view page properly". using rglwidgets, same issues using shinyrgl.

> sessioninfo() r version 3.2.4 revised (2016-03-16 r70336) platform: x86_64-pc-linux-gnu (64-bit) running under: ubuntu 14.04.4 lts  locale:  [1] lc_ctype=en_us.utf-8       lc_numeric=c  [3] lc_time=en_us.utf-8        lc_collate=en_us.utf-8  [5] lc_monetary=en_us.utf-8    lc_messages=en_us.utf-8  [7] lc_paper=en_us.utf-8       lc_name=c  [9] lc_address=c               lc_telephone=c [11] lc_measurement=en_us.utf-8 lc_identification=c  attached base packages: [1] stats     graphics  grdevices utils     datasets  methods   base  other attached packages: [1] shiny_0.13.2       rmarkdown_0.9.5    knitr_1.12.3       rglwidget_0.1.1434 [5] rgl_0.95.1441  loaded via namespace (and not attached):  [1] htmlwidgets_0.6 magrittr_1.5    r6_2.1.2        tools_3.2.4  [5] htmltools_0.3.5 rcpp_0.12.4     jsonlite_0.9.19 digest_0.6.9  [9] xtable_1.8-2    httpuv_1.3.3    mime_0.4


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