Black boxes in the legend (fpp3)

[maxdevblock]

Hi.
I'm having an issue with fpp3 legends in R: instead of the colored boxes of prediction intervals, I'm getting black boxes.
Am I missing something? Do I need to install any additional packages?

This is happening both on macOS (15.6.1 on Apple M1), Windows 11 and Ubuntu 24 LTS. I'm using the latest stable versions of RStudio, R and fpp3 package.
On macOS:
RStudio: 2025.09.0+387 (2025.09.0+387)
R: version 4.5.1 (2025-06-13)
fpp3 1.0.2

Any suggestions?
Thank you.

[robjhyndman]

I think you need to update your packages. Specifically, make sure ggplot2, feasts and fabletools are up-to-date. But in general, it is a good idea to keep all packages update to latest versions.

[maxdevblock]

Hi Rob.
It seems that all packages are up to date.
Running old.packages() the response is NULL.

Here's the response of sessionInfo():

R version 4.5.1 (2025-06-13 ucrt)
Platform: x86_64-w64-mingw32/x64
Running under: Windows 11 x64 (build 26100)

Matrix products: default
  LAPACK version 3.12.1

locale:
[1] LC_COLLATE=Italian_Italy.utf8  LC_CTYPE=Italian_Italy.utf8    LC_MONETARY=Italian_Italy.utf8
[4] LC_NUMERIC=C                   LC_TIME=Italian_Italy.utf8    

time zone: Europe/Rome
tzcode source: internal

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

other attached packages:
 [1] fable_0.4.1       feasts_0.4.2      fabletools_0.5.1  tsibbledata_0.4.1 tsibble_1.1.6    
 [6] ggplot2_4.0.0     lubridate_1.9.4   tidyr_1.3.1       dplyr_1.1.4       tibble_3.3.0     
[11] fpp3_1.0.2       

loaded via a namespace (and not attached):
 [1] gtable_0.3.6         compiler_4.5.1       crayon_1.5.3         tidyselect_1.2.1    
 [5] Rcpp_1.1.0           scales_1.4.0         ggdist_3.3.3         R6_2.6.1            
 [9] labeling_0.4.3       generics_0.1.4       distributional_0.5.0 pillar_1.11.1       
[13] RColorBrewer_1.1-3   rlang_1.1.6          S7_0.2.0             timechange_0.3.0    
[17] cli_3.6.5            progressr_0.16.0     withr_3.0.2          magrittr_2.0.4      
[21] digest_0.6.37        grid_4.5.1           rstudioapi_0.17.1    rappdirs_0.3.3      
[25] lifecycle_1.0.4      anytime_0.3.12       vctrs_0.6.5          glue_1.8.0          
[29] farver_2.1.2         purrr_1.1.0          tools_4.5.1          pkgconfig_2.0.3     
[33] ellipsis_0.3.2 

Running a simple script like this

library(fpp3)

recent_production <- aus_production |>
  filter(year(Quarter) >= 1992)

fit_beer <- recent_production |>
  model(TSLM(Beer ~ trend() + season()))

fc_beer <- forecast(fit_beer)

fc_beer |>
  autoplot(recent_production) +
  labs(
    title = "Forecasts of beer production using regression",
    y = "megalitres"
  )

I get this plot, with black boxes in the legend

Is there something else I could do to help identify the issue?

Many thanks!

[mitchelloharawild]

This is a bug in ggplot2 v4.0.0, which I've fixed in the development version. You can either install ggplot2 v3.5.2 or the development version of ggplot2 with remotes::install_github("tidyverse/ggplot2").

More details here: mjskay/ggdist#262

[maxdevblock]

Hi Mitchell.
I installed the development version. Now everything is ok!
Thank you.