[tex-live] Error with TL 2015 (involving `floatrow')

[Denis Bitouzé]

Hi,

the following M (non) WE example:

--8<---------------cut here---------------start------------->8---
\documentclass{article}
\usepackage{kpfonts}
\usepackage{booktabs}
\usepackage{siunitx}
\usepackage{pgfplots}
\usepackage{floatrow}
\begin{document}
Foo
\end{document}
--8<---------------cut here---------------end--------------->8---

used to compile like a charm with TL 2014 but fails to compile with an
up to date TL 2015 with error:

  ┌────
  │ (/usr/local/texlive/2015/texmf-dist/tex/latex/floatrow/floatrow.sty
  │ (/usr/local/texlive/2015/texmf-dist/tex/latex/caption/caption3.sty)
  │ ! No room for a new \dimen .
  │ \ch at ck ...\else \errmessage {No room for a new #3}
  │                                                   \fi 
  │ l.485 ...finable\flrow at foot{\newinsert\flrow at foot}
  │                                                   
  │ ? 
  └────

AFAICS:

- using the `etex' package doesn't help,
- it is enough to remove anyone of the packages to "solve" the problem,
- it is enough to exchange `pgfplots' and `floatrow' to really solve the
  problem (but is not enough with some additional packages where another
  rearrangements are necessary).

It's unfortunate that such old files suddenly do not compile without
changes. So it could be nice to find and fix what is responsible of this
trouble. Do you have any idea?

Thanks in anticipation.
-- 
Denis