pandoc document conversion error in rmarkdown

Question

I just updated RStudio from 0.98.1028 to 0.98.1074 (latest as of today) and started hitting the error below (RStudio support forum) on a knit-to-HTML script which worked previously. It seems like this may be due to caching, but I have opts_chunk$set(cache=F) at the beginning of my .Rmd.

pandoc: Could not find data file templates/default.html
Error: pandoc document conversion failed with error 97
Execution halted

Other possibly relevant items:

• I'm using knitrBootstrap v1.0.0
• I'm on Ubuntu
• The analysis outputs graphics in ggplot and kable form, but the error remained when commenting those out