There’s a split over whether a certificate of appealability is needed to appeal the denial of a Rule 60(b) motion. See here at 6 & n.3.
There’s a split over whether a plaintiff can dismiss all claims against just one of multiple defendants under Rule 41(a)(1)(A). See here at 2.
There’s a split over whether parties can use Rule 30(b)(6) depositions to explore facts underlying legal claims and theories. See here at 2 n.1.
There’s a split over whether all defendants must provide written consent within 30 days, and what form that consent must take, for removal under 28 U.S.C. § 1446. See here at 8-9.
And (surprise, surprise) there are splits in an ERISA case. See here at 8 & 12 n.9.