I've just started having a problem with my fins (care of B9 Procedural Wings) suddenly overheating and exploding on ascent. I've tried using both the sounding rockets and the orbiter in the RP-0 tutorial, near as I can emulate them, and it happens on all of them (or would, if the initial sounding rocket cut out 5-10 s later). With the WAC Corporal-style rocket, it's happening right around 55 s into flight, in the 40 km range; with the orbiter, it happens more around the 60 km range. It's not such a big deal with the sounding rockets since they're nearly finished their burn by that point, but it's making it quite difficult to keep my orbiter doing its gravity turn, and quite often results in my second stage colliding with the first on separation.
I'm working on a clean install, just RO, RP-0 and RSS with all three's recommended mods only, plus Active Texture Management - Basic and a set of flags (all via CKAN). I've also pruned off all the parts replaceable with procedural parts, for what it's worth. I've run RP-0 previously, which was in early January of this year, but I never had any parts overheating on ascent despite constructing the exact same rockets. (I stopped playing that time due to my game constantly crashing, but that doesn't seem to be a problem anymore. Running a minimal install of RP-0 is definitely helping )
Is this expected behaviour, and perhaps should the wiki tutorial be updated and/or I learn to make better fins for some apparent change in heat mechanics? Or am I just bugging out? Thanks.