LaTeX can, by default, only cope with 18 outstanding floats; any more, and you get the error “too many unsuppressed floats”. This package releases the limit; TeX itself imposes limits (which are interdependent of the help offered by e-TeX). However, if your floats can’t be placed anywhere, extending the number of floats merely delays the arrival of the inevitable error message.
(http://tex.stackexchange.com/questions/46512/too-many-unprocessed-floats#comment372412_46514)
