More drama is unfolding in the high-stakes court battle between the makers of Equal and Splenda with a court filing Thursday that suggests their recent settlement may be dissolving.

In the motion, Equal’s maker, Merisant, claims that Splenda’s maker, McNeil Nutritionals, is breaching the confidential settlement agreement the two companies struck last month when it became clear that a jury was poised to return a verdict in Merisant’s favor.