It's been happening for awhile so Hijack version number won't help but I have been using the Jemplode animation editor to load up my own small animatioons.
I don't think it's dangerous in amy way but all the same is strange. What happening is when my animation is playing out sometimes towards the end of it the player boot screen interweaves through it flashing in/out but this weirdness comes & goes w/same animation. The animations aren't large ones, but happens w/both large (60 frame) animations as well as small (30 frames).
Again I don't what it is and I don't think it's all that important but thought I'd mention it.