According to a report from TMZ.com, on April 15, a feud erupted on set after Lea left to deal with a personal matter and made everyone wait--Naya wasn't happy and reportedly complained to producers. Lea was said to have stormed off after hearing about the complaint.
An insider tells HollywoodLife.com that wasn't the case, explaining, "Lea didn't even know that Naya complained, if that did in fact happen. She (Naya) showed up to the set in really bad shape--she's been acting more and more erratically on set. She went off on one of the producers on the show and they got really upset with her and it escalated from there."
Naya reportedly has been less than a pleasure to work with, as the source noted, "Naya's been showing up, clashing with a few cast mates, and [her] behavior's been a little erratic and unpredictable. This time around, she's trying to pin it on Lea. It makes no sense, especially since the two girls were on the set together but they weren't actually working [on a scene] together."