I use Windows 10 with Rstudio version 1.2.5042 and R 4.0.0.

I am a beginner in R and using R for my thesis work.

I constructed a “quite complex” formula with map function

that I can only run until a too complex change of the formula.

Complex change: if I substitute a **categorial variable** (5 levels) in my **first working formula**

by a **numeric variable** (1-5), R cannot finish calculating.

(First high CPU utilisation of both RStudio R Session and of Qt QtWebenigneprocess,

then only of QtQtWebengineprocess).

The stop button does not work, I have to “kill” RStudio tasks,

I also did a newstart of my PC.

Thereafter, even if I change to the **simpler formula again** (that worked first),

RStudio cannot finish calculating, anymore.

Only RGui (64 bit) show results.

I tried new installing of my RStudio and R version without success.

Even after creating a new User Profile and after deleting the following files,

nothing seems to work:

- %userprofile%\AppData\Local\Temp
- %userprofile%\AppData\Local\RStudio-Desktop
- %userprofile%\AppData\Roaming\RStudio\Desktop.ini

Only on a **new installed PC** with my **transferred data**,

I can run the code **until I change the formula**, again. Thereafter the same problems arise.

What can I do to establish the initial situation?

Thank's a lot!