[Haskell-beginners] Vaccum Cairo Errors

Hi all, I am trying out the awesome Vacuum Cairo package on GHC 6.10.3 but I am getting some interesting errors. The following works in GHCI:

view [1 .. 3]

But the following does not work in GHCI:

let x = [1 .. 3] view x

or,

x <- return [1 .. 3] view x

For the last two I get: context: "(:)|0" -> >>> {"1|1", <<< "(:)|2"} ghc: ../../src/xcb_lock.c:77: _XGetXCBBuffer: Assertion `((int) ((xcb_req) - (dpy->request)) >= 0)' failed. Aborted and GHCI quits. Any ideas? thanks ... deech