Update: I resolved this. The problem came down to a canvas adjustment I had made to resolve some rendering/anti-aliasing issues awhile ago, and somehow overlooked when analyzing this issue. Disabling that change fixed this problem (and I found a better solution to the original problem).
In the end, there doesn’t appear to be a problem at BJS as described above. (It may be best to remove this post, as it doesn’t really provide much insight to real issues - unless it may perhaps be useful to someone who somehow manages to encounter these issues for similar reasons! But my vote is no - this thread should go! LOL)
Thanks guys for your help nonetheless 