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Looks like a bug under High Sierra.
<div class="">Repro</div>
<div class="">1. Close any open Quartz graphics window</div>
<div class="">2. Running the example on the top of the cowplot page you linked.</div>
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</div>
<div class="">Obtained: useMethod("depth") error when the second plot tries to render (no need to resize the window)
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<div class="">Running the code a second time (i.e., when an already open graphics window) there's no error.</div>
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<div class="">Repro code:</div>
<div class="">
<div class="">theme_set(theme_cowplot(font_size=12)) # reduce default font size</div>
<div class="">plot.mpg <- ggplot(mpg, aes(x = cty, y = hwy, colour = factor(cyl))) + geom_point(size=2.5)</div>
<div class="">plot.diamonds <- ggplot(diamonds, aes(clarity, fill = cut)) + geom_bar() + theme(axis.text.x = element_text(angle=70, vjust=0.5))</div>
<div class="">plot_grid(plot.mpg, plot.diamonds, labels = c('A', 'B'))</div>
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</div>
<div class="">Error in UseMethod("depth") : </div>
<div class=""> no applicable method for 'depth' applied to an object of class "NULL"</div>
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</div>
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<div>
<div>sessionInfo()</div>
<div>R version 3.4.1 (2017-06-30)</div>
<div>Platform: x86_64-apple-darwin15.6.0 (64-bit)</div>
<div>Running under: macOS High Sierra 10.13</div>
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</div>
<div>Matrix products: default</div>
<div>BLAS: /Library/Frameworks/R.framework/Versions/3.4/Resources/lib/libRblas.0.dylib</div>
<div>LAPACK: /Library/Frameworks/R.framework/Versions/3.4/Resources/lib/libRlapack.dylib</div>
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</div>
<div>locale:</div>
<div>[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8</div>
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</div>
<div>attached base packages:</div>
<div>[1] stats graphics grDevices utils datasets methods base </div>
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<div>other attached packages:</div>
<div>[1] cowplot_0.8.0 ggplot2_2.2.1 umx_1.8.0 OpenMx_2.7.16-8 devtools_1.13.3</div>
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<div>loaded via a namespace (and not attached):</div>
<div> [1] Rook_1.1-1 purrr_0.2.3 splines_3.4.1 lattice_0.20-35 colorspace_1.3-2 htmltools_0.3.6 viridisLite_0.2.0 XML_3.98-1.9 rlang_0.1.2 </div>
<div>[10] nloptr_1.0.4 glue_1.1.1 withr_2.0.0 RColorBrewer_1.1-2 bindrcpp_0.2 bindr_0.1 plyr_1.8.4 stringr_1.2.0 munsell_0.4.3 </div>
<div>[19] gtable_0.2.0 visNetwork_2.0.1 htmlwidgets_0.9 memoise_1.1.0 labeling_0.3 DiagrammeR_0.9.2 parallel_3.4.1 visreg_2.4-1 Rcpp_0.12.12 </div>
<div>[28] xtable_1.8-2 readr_1.1.1 scales_0.4.1 jsonlite_1.5 rgexf_0.15.3 lme4_1.1-13 gridExtra_2.2.1 polycor_0.7-9 brew_1.0-6 </div>
<div>[37] hms_0.3 digest_0.6.12 stringi_1.1.5 dplyr_0.7.2 numDeriv_2016.8-1 grid_3.4.1 influenceR_0.1.0 tools_3.4.1 magrittr_1.5 </div>
<div>[46] lazyeval_0.2.0 tibble_1.3.4 tidyr_0.7.0 pkgconfig_2.0.1 MASS_7.3-47 Matrix_1.2-10 downloader_0.4 minqa_1.2.4 assertthat_0.2.0 </div>
<div>[55] rstudioapi_0.6 viridis_0.4.0 R6_2.2.2 sfsmisc_1.1-1 igraph_1.1.2 nlme_3.1-131 compiler_3.4.1 </div>
<div>> </div>
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<blockquote type="cite" class="">
<div class="">On 29 Aug 2017, at 4:49 pm, Brandon Hurr <<a href="mailto:brandon.hurr@gmail.com" class="">brandon.hurr@gmail.com</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div dir="ltr" class="">Tim,
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<div class="">I've run the example code on the page below and resized the plots with no errors. </div>
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</div>
<div class=""><a href="https://cran.r-project.org/web/packages/cowplot/vignettes/plot_grid.html" class="">https://cran.r-project.org/web/packages/cowplot/vignettes/plot_grid.html</a><br class="">
</div>
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</div>
<div class="">It may have something to do with running High Sierra, or the specific code/data you are using.</div>
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</div>
<div class="">Could you post a reproducible example?</div>
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<div class="">Brandon</div>
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<div class="gmail_extra"><br class="">
<div class="gmail_quote">On Tue, Aug 29, 2017 at 8:26 AM, BATES Timothy <span dir="ltr" class="">
<<a href="mailto:tim.bates@ed.ac.uk" target="_blank" class="">tim.bates@ed.ac.uk</a>></span> wrote:<br class="">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Resized a plot window and got this error in the console<br class="">
<br class="">
Error in UseMethod("depth") :<br class="">
no applicable method for 'depth' applied to an object of class "NULL"<br class="">
<br class="">
<br class="">
The plot was two ggplot2 graphs side by side, made using cowplot::plot_grid()<br class="">
<br class="">
Set up is<br class="">
R version: R version 3.4.1 (2017-06-30)<br class="">
Platform: x86_64-apple-darwin15.6.0<br class="">
MacOS: 10.13 Beta (17A352a)<br class="">
<br class="">
<br class="">
Is there a githuib or other page to log bugs in Mac R.app?<br class="">
<br class="">
best, tim<br class="">
</blockquote>
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