We just "upgraded" to SW2012 SP5, and found an issue that has been around for awhile that I thought had been corrected. Easy workaround, but hate dislike workarounds...
So if we have the main assembly open with a sub-assembly that is flexible, and we open that subassembly we still get the grayed out reload button. Just wondering/making sure that is the norm still in this release. (customer issue prohibits us from moving to SW2013)