Rstudio Addins not working (Shiny?)

These seemed to be working, then I updated R, Rstudio, and all packages... now, addins that require a shiny-interactive popup, appear to not be working. The app opens, but is blank (others that, say, just add in a bit of code, are fine).

In fact, even the window that allows me to "browse add ins" is doing this.

This error appears in the console:

Listening on
Error in .Call("_later_execCallbacks", PACKAGE = "later", timeoutSecs, :
Incorrect number of arguments (2), expecting 1 for '_later_execCallbacks'

Not sure why, but I just had to manually put the package "later" into the correct library folder & then everything worked!

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