When using foreinblockquote from csquotes with the class memoir, if the quote spreads across pages, the document won't compile but will fail with the message "Missing } inserted."
The following minimal example illustrates the problem :
\documentclass{memoir}
\usepackage{polyglossia}
\setdefaultlanguage{english}
\setotherlanguage{latin}
\usepackage{lipsum}
\usepackage{csquotes}
\begin{document}
\foreignblockquote{latin}{\lipsum[1-5]}
%The following would work as four paragraphs fit on a single page
%\foreignblockquote{latin}{\lipsum[1-4]}
\end{document}