To follow up with some more info:

As the trace indicates, the problem seems to be caused by an svg image that website tries to load. This happens only when I start emacs in a terminal (with the '-nw' flag). The website loads fine

- when emacs runs in an x window (so plain 'emacs' rather than 'emacs -nw');
- in a terminal, provided I disable svg images with 

 (setq shr-blocked-images "svg")

So there are ways around this, but surely eww could handle this more gracefully? Perhaps with the right combination of compile config options?

On December 5, 2019 9:33:24 PM EST, Stuart Little <achirvasub@gmail.com> wrote:
>I am running the latest emacs compiled from source (27.0.50). My
>configuration parameters are in the configure.txt attached file.
>
>My problem:
>
>M-x eww RET arxiv.org RET
>
>returns the error in the title of this message:
>
>error in process filter: Window system frame should be used
>
>I am attaching the debugger trace produced upon setting debug-on-error
>to 't' (the file is trace.txt).  

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