time-sensitive screen clearing

[Jude DaShiell]

Speakup with debian sid with all updates applied as of March 28, 2009 on 
this system is allowing files to open and for a short time displaying 
their contents then clearing the screen so it's like the file you're 
reading appears blank.  Hopefully nobody else is experiencing this 
behavior.  I first ran into this while debugging an iching hexagram 
generator I was writing with vbnc.  I ended up deleting the source file 
since I have a copy of an earlier source and executable this did not pose 
any problems.  I was doing a search and destroy mission on characters 
outside the printable character set in ascii and right after I searched 
for \f and told ex to remove those this behavior started.  A system reboot 
did nothing to clear it either.