I noticed this problem when I installed the Demo version of HBX (Hardware Button Extender), when I disabled that hack, it did not do this, but with it enabled, I got longer than 15second blank screens. Try disabling all hacks and then opening the flip.

If you find out which hack/improvement seems to cause this, then you can either upgrade and hope to fix, or decide which is more important.

For me, I disabled HBX, and life is fine.

Scott