I have probably the exact same issue - binTiles doesn't work while "old" save loads well.
Linux, yaml-cpp both v0.7.0 from packages and freshly compiled from master, various OXCE versions including latest `oxce-plus` branch (c59419b4914d350131f4c947392baff11b3ccbc6), v7.0 commit and a few random commits in between.
Tried Yankes' patch: (github)/cptMikky/OpenXcom/commit/09aab335576996930a4e914de11cd8ba25492a78
It works but only with saves created with that patch - old saves still don't load correctly, see attachments:
t1.sav - created by an unpatched build directly after loading Yankes' hacked save
t2.sav - created by patched build from the hacked save
t1 doesn't load correctly but t2 does.
I'm not yet 100 % convinced this is a yaml-cpp issue but if it is, we should maybe try to describe the bug and post it upstream.
OT: why are github issues disabled for OXCE?