Rmd not rendering on Windows with latest Preview build

[lgaborini]

System details

Rstudio 1.2.1009 build 1039 (e9babcc)
R version 3.5.1 (2018-07-02)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

Steps to reproduce the problem

Rstudio does not knit/render any .Rmd, even the default template.

When the Knit button is pressed, it inserts a blank character in the path (just after the .Rmd) and fails.
However, the knitting works if called from the console.

==> rmarkdown::render('C:/Users/Lorenzo/test_rmd.Rmd',  encoding = '');
Error: unexpected end of input
Execution halted

See the screenshot:

Rstudio Preview 1.2.907 was not affected.

sessionInfo() output:

Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

Matrix products: default

locale:
[1] LC_COLLATE=Italian_Italy.1252  LC_CTYPE=Italian_Italy.1252   
[3] LC_MONETARY=Italian_Italy.1252 LC_NUMERIC=C                  
[5] LC_TIME=Italian_Italy.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
 [1] compiler_3.5.1  backports_1.1.2 magrittr_1.5    rsconnect_0.8.8 rprojroot_1.3-2
 [6] htmltools_0.3.6 tools_3.5.1     yaml_2.2.0      Rcpp_0.12.18    stringi_1.2.4  
[11] rmarkdown_1.10  knitr_1.20      stringr_1.3.1   digest_0.6.17   evaluate_0.11

[ronblum]

@lgaborini Thank you for reporting this. I'm able to reproduce this on Windows 10 and we will take a look at this issue.

[kevinushey]

This should be resolved in the latest daily builds of RStudio. (This is another manifestation of #3548)

[jmcphers]

I've updated the preview release to 1.2.1013-1, which should have a fix for this issue. @lgaborini please re-open if you find it isn't fixed for you!

[dfalty]

Verified fixed on version 1.2.1090.