I installed the most recent Rstudio Preview version (1.2.1060) for Windows but I cannot edit the source pane... I can code in the console just fine, but impossible to edit an .R or .Rmd file.
I uninstalled / re-installed Rstudio a couple of times, but I'm still facing the same issue.
R version 3.5.1 (2018-07-02) Platform: x86_64-w64-mingw32/x64 (64-bit) Running under: Windows 10 x64 (build 14393) Matrix products: default locale:  LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252  LC_MONETARY=English_United States.1252 LC_NUMERIC=C  LC_TIME=English_United States.1252 attached base packages:  stats graphics grDevices utils datasets methods base loaded via a namespace (and not attached):  compiler_3.5.1 tools_3.5.1 yaml_2.2.0 packrat_0.4.9-3
Anyone else ran into this issue?