Killer seagulls

I spent the last week trapped at work, which was extremely conducive to making progress on my game.  After spending the weekend chasing down some last minute bugs (had to redo the parallax scrolling and the entire concept behind activating/deactivating enemies based off of camera position) I’m finally ready to upload another build.  There’s still a random bug I can’t pin down:  every once in a while, the left and/or right images of a dialogue box won’t delete when the dialogue is over.  I can’t reproduce it with any regularity, and I can’t think of any reason that it’s happening.  Whenever I try to make it happen, it’ll work perfectly ten times in a row, and only once I’m playing to test some other feature does it ever crop up.  If anybody sees it, can you tell me what’s going on?  Were you pressing the arrow keys at the time?  Where did you click to end the dialogue?  Which dialogue did it stick at?
I’ll also be spending the next week or so stuck at work, so I foresee finishing up the final boss, and tweaking the level design until I’m satisfied.  Hopefully I’ll get around to starting the top-down engine, too.  Once I finish with that, it’s just a matter of designing each level and enemy behavior before I’ll have a playable prototype.
This is all finally coming together rather nicely.