When typing in Console (in RStudio) repeatly get error 'attr' error msg

I am reposting this bug report because I am experiencing it and it has not been resolved.

No code. I am in Rstudio and typing into console, with screeen just cleared (Cntrl-L).

> 

I start typing, first 2 letters (of library), all good.

> li

as I soon as add b, screen has this.

Error in base::attr(..., exact = TRUE) : 
  formal argument "exact" matched by multiple actual arguments
>lib

if I now add r, message appears twice.

Error in base::attr(..., exact = TRUE) : 
  formal argument "exact" matched by multiple actual arguments
Error in base::attr(..., exact = TRUE) : 
  formal argument "exact" matched by multiple actual arguments
> 
>libr

And eventually looks something like this:

... 
  formal argument "exact" matched by multiple actual arguments
Error in base::attr(..., exact = TRUE) : 
  formal argument "exact" matched by multiple actual arguments
UE) : 
  formal argument "exact" matched by multiple actual arguments
Error in base::attr(..., exact = TRUE) : 
  formal argument "exact" matched by multiple actual arguments
...
> 
> 
>library

The old report claims to have resolved the bug, but the solution involves deactivating autocompletion altogether - clearly not a satisfactory solution. Let me add that removing .Rproj.user or resetting R's desktop state (as proposed by @prubin) don't work.
However, commenting the entire .Rprofile, terminating R, and then running my project's .Rprofile manually, solves the issue. Obviously, I'd like a definitive fix, not a workaround that I have to repeat each time I open RStudio.