BUG while drawing several strokes quickly

Received as a comment on a blog post :

I am also glad that Pencil is coming back to life. THANKS !

I downloaded the Mac build Pencil-dev-0.5.3b-mac.zip and am running it on Mac OS 10.7.5 , working in Pencil with a Cintiq tablet. I’m find that sometimes if I draw several strokes quickly that the app hangs (spinning beachball) for 10 – 30 seconds. Not sure if anyone else using it on Mac is reporting this hanging issue , but just wanted to let you know .