Are themes cached and how do I remove them?

[furrrpanda]

Describe the problem

I'm working on multiple Shiny apps with different themes and sometimes when I run and A, it uses the theme from app B. Even though I cleared the memory using gc() and removed everything from the working environment in R. Is this normal behaviour? Sorry, but I cant reproduce it.

[cpsievert]

Unfortunately there is some tricky scenarios in which this can happen, and the only/best way to fix it currently is to restart the R session.