Hi Tom,
We've had limited reports of this before. In one instance, it was resolved by disabling the anti-virus software (avast): https://github.com/rstudio/rstudio/issues/5858
Do you have AV running that you can disable as a test?
Does the same problem occur if you run RStudio as an administrator?
Another reported issue self resolved: https://github.com/rstudio/rstudio/issues/5367
There it was suggested to try the dailies: https://dailies.rstudio.com/
The preview version is also available here: RStudio Preview - RStudio
If none of the above helps, we encourage you to file a new issue here: https://github.com/rstudio/rstudio/issues
Kind regards!