Fixed #7.

ifiseries.sty

@@ -162,6 +162,18 @@
 \fi
 \RequirePackage[\ifiseries@babelOptions]{babel}
 
+% To avoid a possible error with TeXLive 2015 (at least on Mac), we
+% include floatrow as early as possible.
+\ExplSyntaxOn
+\renewcommand{\ifiseries@temp}[1]{
+\str_case:nnn{#1}{
+{} {\relax}
+{floatrow} {\RequirePackage{floatrow}\DeclareCaptionSubType[alph]{figure}}
+{subfig} {\RequirePackage[\ifiseries@subfigOptions]{subfig}\RequirePackage{sidecap}\sidecaptionvpos{figure}{t}}
+}{\PackageError{ifiseries}{Unknown~figure~system:~#1}\@ehc}}
+\expandafter\ifiseries@temp\expandafter{\ifiseries@figure}
+\ExplSyntaxOff
+
 \RequirePackage{amsmath}
 \ififiseries@mathabx
   \RequirePackage[matha]{mathabx}
@@ -296,16 +308,6 @@
 \RequirePackage{changes}
 \normalem
 
-\ExplSyntaxOn
-\renewcommand{\ifiseries@temp}[1]{
-\str_case:nnn{#1}{
-{} {\relax}
-{floatrow} {\RequirePackage{floatrow}\DeclareCaptionSubType[alph]{figure}}
-{subfig} {\RequirePackage[\ifiseries@subfigOptions]{subfig}\RequirePackage{sidecap}\sidecaptionvpos{figure}{t}}
-}{\PackageError{ifiseries}{Unknown~figure~system:~#1}\@ehc}}
-\expandafter\ifiseries@temp\expandafter{\ifiseries@figure}
-\ExplSyntaxOff
-
 \RequirePackage[\ifiseries@acronymOptions]{acronym}
 \RequirePackage{xspace}
 \RequirePackage[\ifiseries@hyphenatOptions]{hyphenat}