What kind of problems?
Im not able to get a link on the 10Gb ports. Either looped to each other or to a 1Gb switch.
I have tried the ESXi vib 4.1.1. I also tried Windows 2012R2. Also Ubuntu 15.10 with 4.0.1k and I compiled the latest driver 4.1.5
I have only noticed that in Ubuntu it seems to not be able to init the PHY.
[ 513.613563] ixgbe: module verification failed: signature and/or required key missing - tainting kernel
[ 513.615924] Intel(R) 10 Gigabit PCI Express Network Driver - version 4.1.5
[ 513.615928] Copyright (c) 1999-2015 Intel Corporation.
[ 513.616159] ACPI Warning: \_SB_.PCI0.BR2C._PRT: Return Package has no elements (empty) (20150619/nsprepkg-126)
[ 517.439031] ixgbe 0000:03:00.0 0000:03:00.0 (uninitialized): PHY reset polling failed to complete.
[ 518.029617] ixgbe 0000:03:00.0 eno1: renamed from eth0
[ 518.070299] ixgbe 0000:03:00.0 eno1: MAC: 5, PHY: 6, PBA No: 020000-000
[ 518.070312] ixgbe 0000:03:00.0: 0c:c4:7a:7a:e0:b9
[ 518.070320] ixgbe 0000:03:00.0 eno1: Enabled Features: RxQ: 8 TxQ: 8 FdirHash RSC vxlan_rx
[ 518.090252] ixgbe 0000:03:00.0 eno1: Intel(R) 10 Gigabit Network Connection
[ 518.090390] ACPI Warning: \_SB_.PCI0.BR2C._PRT: Return Package has no elements (empty) (20150619/nsprepkg-126)
[ 521.923984] ixgbe 0000:03:00.1 0000:03:00.1 (uninitialized): PHY reset polling failed to complete.
[ 522.511195] ixgbe 0000:03:00.1 eno2: renamed from eth0
[ 522.551221] ixgbe 0000:03:00.1 eno2: MAC: 5, PHY: 6, PBA No: 020000-000
[ 522.551235] ixgbe 0000:03:00.1: 0c:c4:7a:7a:e0:b8
[ 522.551244] ixgbe 0000:03:00.1 eno2: Enabled Features: RxQ: 8 TxQ: 8 FdirHash RSC vxlan_rx
[ 522.571195] ixgbe 0000:03:00.1 eno2: Intel(R) 10 Gigabit Network Connection
[ 563.192802] ixgbe 0000:03:00.1: registered PHC device on eno2
[ 563.611866] IPv6: ADDRCONF(NETDEV_UP): eno2: link is not ready
[ 576.642008] ixgbe 0000:03:00.0: registered PHC device on eno1
[ 577.059632] IPv6: ADDRCONF(NETDEV_UP): eno1: link is not ready