I have not done BitBlitting in a while but I remember there being an Autoredraw on the form and needs to be off? Or is it On? Try then both. I believe it has something to do with AutoReDraw!
hmmm, I've never used both labels and blitted. Play with there AutoReDraws. Worst case make a blitting character set so you can blit your words instead of using labels.
Not sure, I'm not at home so I can't try any of my suggestions! Sorry!
Cheers!